Question

If collision between the block and the incline is completely elastic, then the vertical (upward) component of the velocity of the block at point $B$, immediately after it strikes the second incline is

• A. $\sqrt{30}m/s$
• B. $\sqrt{15}m/s$
• C. $0$
• D. $-\sqrt{15}m/s$

Answer 1

The correct option is C $0$

$v_y=v\sin {30}^0\cos {30}^0\cos {60}^0$

$v_y=0$

Hence,

option $\left(C\right)$ is correct answer.