A ball falling vertically with speed $10m/s$ strikes the fixed inclined plane and rebound at ${45}^{\circ }$ as shown in the figure. Find the value of $60e$, where $e$ is coefficient of restitution.

Q. A small smooth ball is falling vertically downward as shown in figure. The ball strikes a smooth plane which is inclined at an angle 30 to the horizontal. Immediately before striking the plane the ball has speed of 8 $m{s}^{-1}$. The coefficient of restitution 1 between the ball and plane is $\frac{1}{4}$. The speed of the ball just after the impact is:

Q. In the figure shown a particle $P$ strikes the inclined smooth plane horizontally and rebounds vertically. If the angle $\theta$ is ${60}^{\circ }$, then the coefficient of restitution is :

Q. In the figure shown a particle $P$ strikes the inclined smooth plane horizontally and rebounds vertically. If the angle $\theta$ is ${60}^{\circ }$, then the coefficient of restitution is:

Diagram

Q. A ball is moving with velocity $10m/s$ in downward direction as shown in figure. After collision with fixed surface having coefficient of restitution $e=0.5$, it rebounds back with velocity $v\text{m/s}$. Find the value of $v$. (Neglect all external forces)

Q. A steel ball felling vertically strikes a fixed rigid plate A with velocity $v_0$ and rebounds horizontally as shown. Assuming surface to be same nd the effect of gravity on motion of ball to be neglected. If the coefficient of the restitution for the ball 'e' then the value of $e$