Question

A particle of mass 'm' strikes a wall with speed 'v' at an angle 30 degree with the wall elastically . The magnitude of the impulse imparted to the ball by wall is ?

Answer 1

$$\begin{gathered} initialmomentuminxdirection{p}_x=mv\cos 30 \\ initialmomentuminydirection{p}_y=mv\sin 30 \\ finalmomentuminxdirection{p}_x=mvcos30 \\ finalmomentuminydirection{p}_y=-mvsin30 \\ chnageinmomentuminxdirection=0 \\ changeinmomentuminydirection=2mv\sin 30 \end{gathered}$$