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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
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B
22 sec
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C
16 sec
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D
12 sec
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Solution

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=2usinθg=2×802×1216=16 sec

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