JEE

# JEE Important Chapter - Kinematics

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## What is Kinematics?

Kinematics is an important topic for JEE exams. It mainly consists of one-dimensional and two-dimensional motion, and the questions asked in the examination are based on their applications. Compared to other concepts, this section will become easier with adequate practice and conceptual understanding.

In kinematics, first, we will learn about motion along a straight line and discuss different physical quantities like distance, displacement, velocity, etc., and their formulas. Different types of motions are also discussed in this section. Problems related to the three kinematical equations of motion for uniformly accelerated motion are very important. We will also see how we can draw a conclusion about the motion by evaluating and finding required quantities from various graphs.

Coming to motion along a plane, properties of vectors and the law of vector addition like triangular law and parallelogram law of vector additions, scalar and vector product of vectors are important. The problems with projectile motion on a horizontal and inclined plane are frequently asked in JEE exam.

Let us see what is kinematics and the important concepts and formulas needed to score a full marks for this topic in JEE Main with the help of some solved kinematics examples.

### Kinematics - Important Topics

• Motion in a Straight Line

• Kinematics Equations

• Motion under gravity

• Graphs for all types of motion

• Motion in a Plane

• Projectile Motion

• Resolution of Vector Rectangular Components

• Circular Motion

### Solved Examples

1. A balloon carrying a stone rises from rest on the ground with an acceleration of 10 m/s2 in the upward direction. After 5 sec, the stone is released and ultimately reaches the ground. Find the maximum height attained by the height.

Ans:  Here, we will take the upward direction as positive and the downward direction as negative. Given the balloon rises up from rest. Therefore,

The initial velocity of the balloon, u1 = 0 m/s

Acceleration of the ball, a = 10 m/s2

First of all, let us find the height reached by the balloon in 5 seconds before the stone is released using the equation of motion.

$s=ut+\dfrac{1}{2}at^{2}$

Substitute the value of each term in the equation to calculate the height reached by the balloon.

$S=0\times 5+\dfrac{1}{2}\times 10\times 5^{2}$

$S= 125 m$

Now, even after the stone is released, it will continue to move upward for some time because it has some velocity in the upward direction. Then, the initial velocity of the stone is equal to the final velocity of the balloon after 5 sec. So, let us calculate the final velocity of the balloon using the formula given below:

$v=u+at$

Substitute the values and calculate the final velocity.

$v=0+10\times 5$

$v= 50 m/s$

Now, calculate the distance covered by the stone to reach the maximum height where the final velocity is zero by using the formula given below. (Take acceleration due to gravity as -10 m/s2 since it is in the downward direction.)

$v^2=u^2+2as$

$0^2=50^2+2\times (-10)\times$

$20s=2500$

$s=125 m$

Therefore, the maximum height attained by the stone is the sum of the distance travelled by the balloon in 5 sec and the distance travelled by the stone after it is released, i.e, 125 m + 125 m = 250 m

Key Point: The velocity of any body thrown upward will be zero when it reaches its highest point but the acceleration will be equal to the acceleration due to gravity acting downwards.

2. An aeroplane moving at a speed of 180 km/hr drops a food packet while flying at a height of 500 m. Find the horizontal range?

Ans: We will consider the motion along with vertical and horizontal directions separately to apply equations of motion.

First, find the time taken by the packet to reach the ground considering motion along the vertical direction.

The vertical displacement of the packet, Sy = h = 500 m

Initial velocity along vertical direction, uy = 0 m/s

Acceleration of the packet along vertical direction = g = 10 m/s2

$s_y=u_yt+\dfrac{1}{2}a_yt^{2}$

$S_y=u_yt+\dfrac{1}{2}a_yt^{2}$

$500 =0\times t+\dfrac{1}{2}\times 10t^{2}$

$1000=10t^{2}$

$t^2=100$

$t=10s$

Now consider the motion along horizontal direction and calculate the horizontal range using the equation of motion.

Initial velocity along the horizontal direction, ux = 180 km/hr = $180\times \dfrac{5}{18}$ = 50 m/s

Acceleration along the horizontal direction, ax = 0 m/s2

Time taken to reach the ground, t = 10s

$S_x=u_xt+\dfrac{1}{2}a_xt^{2}$

$S=50\times10+\dfrac{1}{2}\times 0\times 10^{2}$

$S_x= 500 m$

Key Point:  Whenever dealing with the problems related to the two-dimensional motion of a body under gravity, consider the motion along with vertical and horizontal directions separately to apply equations of motion.

### Previous Year Questions from JEE Exam

1. Two guns A and B can fire bullets at speeds 1 km/s and 2 km/s respectively. From a point on horizontal ground, they are fired in all possible directions. The ratio of maximum areas covered by bullets fired by two guns on the ground is… (JEE 2019)

Ans: For a projectile motion, maximum range is attained at an angle of 45o. The area covered by the bullets will be equal to the area of the circle with a radius equal to the maximum range of each bullet.

Bullets fired by gun A:

Let RA be the maximum range of the bullets fired by gun A at an angle of  45o.

The velocity of the bullets fired by gun A, uA = 1 km/s

The maximum range of the bullet from gun A is given by

$R_A=\dfrac{u_A^2\sin(2\theta)}{g}$

$R_A=\dfrac{u_A^2\sin(2\times45)}{g}$

$R_A=\dfrac{u_A^2}{g}$

Maximum area covered by the bullets from gun A is

$Area_A=\pi R_A^2$

$Area_A=\pi\left( \dfrac{u_A^4}{g^2}\right)$

Similarly,

The velocity of the bullets fired by gun B, uB = 2 km/s

The maximum range of the bullet from gun B is given by

$R_B=\dfrac{u_B^2}{g}$

Maximum area covered by the bullets from gun B is

$Area_B=\pi R_B^2$

$Area_B=\pi\left( \dfrac{u_B^4}{g^2}\right)$

Then the ratio of two area covered by the bullets fired by gun A and gun B is,

$\dfrac{Area_A}{Area_B}=\dfrac{\pi\left( \dfrac{u_A^4}{g^2}\right)}{\pi\left( \dfrac{u_B^4}{g^2}\right)}$

$\dfrac{Area_A}{Area_B}=\dfrac{u_A^4}{u_B^4}=\dfrac{1^4}{2^4}=\dfrac{1}{16}$ Therefore, the ratio of area covered by the bullets A and B is 1:16.

Key Point:  The maximum range is attained by a given projectile for a given velocity at an angle of 450

2. A stone is dropped from the top of a building. When it crosses a point 5m below the top, another stone starts to fall from a point 25m below the top, both stones reach the bottom of the building simultaneously. The height of the building is: (Take g = 10 m/s2) (JEE 2021 Feb)

Ans: First, we have to  calculate the velocity of the first stone (u1) at a height 5 m below the top of the building using the formula given below.

$u_1=\sqrt {2gh}$

$u_1=\sqrt {2\times 10\times 5}=10m/s$

Now, apply the 2nd equation of motion on the first stone at a point 5 m below from the top till it reaches the ground. Then the displacement covered by the first stone is 20+h.

$20+h=u_1t+\dfrac{1}{2}gt^{2}$

$20+h=10t+\dfrac{1}{2}gt^{2}$.....(1)

For the second stone, the displacement covered to reach the ground is h and the time taken is t. Using the 2nd equation of motion,

$20+h=10t+\dfrac{1}{2}gt^{2}$.....(2)

Put equation (2) in equation (1) to calculate the time t

$20+\dfrac{1}{2}gt^{2}=10t+\dfrac{1}{2}gt^{2}$

t=2s

Now, put t=2s in equation (2) to calculate h

$h=\dfrac{1}{2}\times 10\times 2^{2}=20 m$

The total height of the building = h + 25= 20 + 25 = 45 m

Key Point:  Whenever an object is dropped or released, the initial velocity must be taken as zero.

### Practice Questions

1. A body is projected at 600 with the ground. It covers a horizontal distance of 100 m. If the same body is projected at 600 with vertical with the same velocity, what will be the new range? (Ans: 100 m)

2. A car moving with a speed of 50 km/hr, can be stopped by brakes after at least 6m. If the same car is moving at a speed of 100 km/hr, what will be the minimum stopping distance? (Ans: 24 m)

### Conclusion

So here we discussed important concepts and formulas related to Kinematics from the JEE point of view. Students must make sure that they do not miss any of the above important topics to obtain a good score in the JEE Main exam.

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Chemistry Master Teacher

## JEE Main 2022 Cut-Off

JEE Main Cut Off
NTA is responsible for the release of the JEE Main 2022 June and July Session cut off score. The qualifying percentile score might remain the same for different categories. According to the latest trends, the expected cut off mark for JEE Main 2022 June and July Session is 50% for general category candidates, 45% for physically challenged candidates, and 40% for candidates from reserved categories. For the general category, JEE Main qualifying marks for 2021 ranged from 87.8992241 for general-category, while for OBC/SC/ST categories, they ranged from 68.0234447 for OBC, 46.8825338 for SC and 34.6728999 for ST category.
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## JEE Main 2022 Results

JEE Main 2022 June and July Session Result - NTA has announced JEE Main result on their website. To download the Scorecard for JEE Main 2022 June and July Session, visit the official website of JEE Main NTA.
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Rank List
Counselling
Cutoff
JEE Main 2022 state rank lists will be released by the state counselling committees for admissions to the 85% state quota and to all seats in NITs and CFTIs colleges. JEE Main 2022 state rank lists are based on the marks obtained in entrance exams. Candidates can check the JEE Main 2022 state rank list on the official website or on our site.

## JEE Top Colleges

View all JEE Main 2022 Top Colleges
Want to know which Engineering colleges in India accept the JEE Main 2022 scores for admission to Engineering? Find the list of Engineering colleges accepting JEE Main scores in India, compiled by Vedantu. There are 1622 Colleges that are accepting JEE Main. Also find more details on Fees, Ranking, Admission, and Placement.
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## Counselling

Need more details? Our expert academic counsellors will be happy to patiently explain everything that you want to know.
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## FAQs on JEE Important Chapter - Kinematics

FAQ

1. How many questions are asked from Kinematics in JEE Main?

Mostly, 1-2 questions from this chapter are asked in JEE Main every year which corresponds to around 8 marks in the JEE Main exam.

2. What is the importance of kinematics in the JEE exam?

Compared to other chapters, kinematics concepts will become easier for you once you start practicing more and more questions related to it. You can easily solve all the types of kinematics problems asked from this chapter once you learn all the topics covered in the chapter conceptually. Besides, the concepts discussed in this chapter are linked to problems from other chapters too.

## JEE Main Upcoming Dates

Vedantu offers free live Master Classes for CBSE Class 6 to 12, ICSE, JEE Main, JEE 2022, & more by India’s best teachers. Learn all the important concepts concisely along with amazing tricks to score high marks in your class and other competitive exams.
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