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  4. A highly elastic ball moving at a speed of 3 m / s approaches a wall moving towards it with a speed of 3 m / s. After the collision, the speed of the ball will be

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Q. A highly elastic ball moving at a speed of $3\, m / s$ approaches a wall moving towards it with a speed of $3 \, m / s$. After the collision, the speed of the ball will bePhysics Question Image

Work, Energy and Power

Solution:

For elastic collision, $e=1$.
Let speed of the ball be $v$ towards left after collision,
then w.r.t wall, incident velocity $=$ reflected velocity.
We get $3+3=v-3$
$ \Rightarrow v=9 \,m / s$.