A projectile is thrown from a point on ground with an initial speed u and at anelevatio `theta` to the horizontal. Find the change in momentum of the particle, when it reaches the top most point of its trajectory.

Options

A. 0
B. mu
C. `m u cos theta`
D. `m u sin theta`

Answer

D

Explanation

`vec(P)_(1) = m u cos theta hat(i) + m u sin theta hat(j)`
(at height point) `vec(P)_(t) = m u cos theta hat(i)`
`Delta vec(P) = vec(P)_(t) - vec(P)_(i) = - m u sin theta hat(j)`