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A ball is projected from ground with a v...

A ball is projected from ground with a velocity V at an angle `theta` to the vertical. On its path it makes an elastic collision with a vertical wall and returns to ground. The total time of flight of the ball is

A

`(2vsintheta)/g`

B

`(2vcostheta)/g`

C

`(vsin2theta)/g`

D

`(vcostheta)/g`

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The correct Answer is:
B
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