Question

In the previous problem , if the horizontal surface is rough with friction coefficient `0.5` and collision is elastic , head - on , the distance travelled by the block on the rough surface
A. `5 m`
B. `10 m`
C. `15 m`
D. `20 m`

Answer 1

Correct Answer - B
After the head - on collision , velocities will be exchanged.
`0 = v^() - 2 mu gd`
`0 = 2gL - 2 mu gd`
`d = (L)/(mu) = (5)/(1//2) = 10 m`