A ball of 0.20kg hits a wall at an angle of `45^(@)` with a velocity of `25 ms^(-1)`. If the rebounds at `90^(@)` to the direction of incidence, calculate the change in momentum of the ball.

Explanation

Change in momentum `=(-mv cos 45^(@))-(mv cos 45^(@))=-2mv cos45^(@)`
`rArr|DeltavecP|=2mv cos 45^(@)=2xx0.2xx25xx(1)/sqrt(2)=5sqrt(2) N s`