Question

Seeta is moving due to east with a velocity of 1 m/s and Geeta is moving due west with a velocity of 2m/s. What is the velocity of Seeta with respect to Geeta?

Answer 1

Hint: we apply here concept of motion. Motion, as we know when an object changes its position with respect to its surroundings in a given passage of time. It is of three types i.e. 1-D (one dimensional), 2-D (two dimensional), 3-D( three dimensional).one means straight line , two dimensional means in plane and three dimensional means in space.

Complete answer:
 In this question, Seeta and Geeta move only in one direction but oppositely. So here the motion is one dimensional. Thus we consider the east direction as positive and west direction as negative. Let the velocity of seeta and geeta be $V_S$ and $V_G$ respectively.
Now according to given condition $V_S$ velocity of Seeta =$1$ $m/s$
And $V_G$ velocity of Geeta = $-2$ $m/sec$
Thus the velocity of seeta with respect to Geeta =$V_S -V_G$
= $1 - 2 = 3 m/sec$

Therefore the velocity of seeta with respect to Geeta is $3 m/sec$

Additional Information:
We also use here the concept of relative velocity. Relative velocity means an object B with respect to A. If two bodies are moving in the same direction as the same velocity, then the relative velocity is zero.

Note:
Relative velocity is maximum if two bodies move in the opposite direction along the same line. In a non-relativistic case, the relative velocity is then equal to the sum of the absolute values of velocity. It is very important in kinematics and classical mechanics to examine the motion.