
A long spring is stretched by and its potential energy is . If the spring is stretched by ; its potential energy will be:
A)
B)
C)
D)
Answer
139.8k+ views
Hint: First, calculate the value of the spring constant using the formula for energy in a spring by putting the given values, i.e. and . Then use the same formula by putting and spring constant as calculated previously to get the value of final potential energy. This will be our final answer.
Formula Used:
Potential energy in a spring,
Where, is the spring constant of the spring and the distance by which the string has been stretched, or extended.
Complete step by step solution:
First, we will use the formula for energy in a spring and put , as given to get the value of spring constant . Once we find the value of we will move on to find the potential energy of the spring when it is stretched by , which will be the final answer.
We have, potential energy in a spring,
Where, is the spring constant of the spring and the distance by which the string has been stretched.
For and (given) we get
Now we will use this value of spring constant in the formula of potential energy of the spring with to calculate the potential energy of spring in this case.
Therefore, we get
On simplifying, we are left with
Which gives,
Hence, option D is the correct answer.
Note: In questions like these, make sure both the values of extension of spring are given with the same unit. If the units are different, make sure you convert the given values into the same unit before using the values in an answer. Otherwise, you may end up getting the wrong answer. A spring stores energy as potential energy and releases the stored energy as kinetic energy. The kinetic energy released is proportional to the square of the length by which the spring is compressed or stressed. Thus, the potential energy is also directly proportional to the square of the length by which the spring is compressed or stressed.
Formula Used:
Potential energy in a spring,
Where,
Complete step by step solution:
First, we will use the formula for energy in a spring and put
We have, potential energy in a spring,
Where,
For
Now we will use this value of spring constant in the formula of potential energy of the spring with
Therefore, we get
On simplifying, we are left with
Which gives,
Hence, option D is the correct answer.
Note: In questions like these, make sure both the values of extension of spring are given with the same unit. If the units are different, make sure you convert the given values into the same unit before using the values in an answer. Otherwise, you may end up getting the wrong answer. A spring stores energy as potential energy and releases the stored energy as kinetic energy. The kinetic energy released is proportional to the square of the length by which the spring is compressed or stressed. Thus, the potential energy is also directly proportional to the square of the length by which the spring is compressed or stressed.
Latest Vedantu courses for you
Grade 10 | CBSE | SCHOOL | English
Vedantu 10 CBSE Pro Course - (2025-26)
School Full course for CBSE students
₹35,000 per year
EMI starts from ₹2,916.67 per month
Recently Updated Pages
Average fee range for JEE coaching in India- Complete Details

Difference Between Rows and Columns: JEE Main 2024

Difference Between Length and Height: JEE Main 2024

Difference Between Natural and Whole Numbers: JEE Main 2024

Algebraic Formula

Difference Between Constants and Variables: JEE Main 2024

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

JEE Main 2025: Conversion of Galvanometer Into Ammeter And Voltmeter in Physics

Degree of Dissociation and Its Formula With Solved Example for JEE

Other Pages
Units and Measurements Class 11 Notes: CBSE Physics Chapter 1

JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 11 Physics Chapter 1 Units and Measurements

Motion in a Straight Line Class 11 Notes: CBSE Physics Chapter 2

Important Questions for CBSE Class 11 Physics Chapter 1 - Units and Measurement

NCERT Solutions for Class 11 Physics Chapter 2 Motion In A Straight Line
