Question

A body goes from C to D with a velocity of $20m{s}^{-1}$ and comes back from D to C with a velocity of $30m{s}^{-1}$. The average velocity of the body during the whole journey is:

• A. $25m{s}^{-1}$
• B. 0.0
• C. $20m{s}^{-1}$
• D. $26m{s}^{-1}$

Answer 1

The correct option is B 0.0

Given:
Initial velocity, $u=20m{s}^{-1}$
Final velocity, $v=-30m{s}^{-1}$
Final point of motion is the same as the initial point of motion.

As the body comes back to the initial position, the total displacement is $0$.

Velocity is defined as the rate of change of displacement.
Therefore, average velocity is $0$.