Question

A ball projected from the ground hits a wall at 480 m. If collision of ball with wall is elastic, then after what time will the ball land on the ground ?

• A. 8 sec
• B. 22 sec
• C. 16 sec
• D. 12 sec

Answer 1

The correct option is C 16 sec

There is no change in time of flight as collision frame is horizontal and does not affect vertical motion.

$T=\frac{2u\sin \theta }{g}=\frac{2\times 80\sqrt{2}\times \frac{1}{\sqrt{2}}}{16}=16\text{sec}$