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 collison with a vertical wall and returns to ground. The total time of flight of the ball is

`( 2v "sin" theta)/(g)`

`( 2v "cos" theta)/(g)`

`( v "sin" 2theta)/(g)`

`( v "cos" theta)/(g)`

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