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An object of m kg with speed of v m s^(-...

An object of m kg with speed of v `m s^(-1)` strikes a wall at an angle `theta` and rebounds at the same speed and same angle. Find the magnitude of change in the momentum of object.

A

`2m v cos theta`

B

`2m v sin theta`

C

0

D

2mv

Text Solution

Verified by Experts

The correct Answer is:
A
Initial Momentum `P_(i) = (mv sin theta) hat(i)- (mv cos theta)hat(j)`

Final momentum `P_(f)= (mv sin theta) hat(i) + (mv cos theta) hat(j)`

Change in momentum `(Delta vec(P))= P_(f)- P_(i) = (2mv cos theta) hat(j)`
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