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

Answer: (C)

0

After collision, vertical velocity will be

$vsin\left({30}^0\right)cos\left({30}^0\right)-vcos\left({30}^0\right)cos\left({60}^0\right)=0$.