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A ball is thrown from a point O with a v...

A ball is thrown from a point O with a velocity `u=20ms^(-1)` at an angle `theta=30^(@)` with the horizontal.It hits a vertical wall which is at a distance x , from O as shown in the figure.After rebounding from the wall, the ball returns to O without retracing its path. If `g=10ms^(-2)` and the coefficient restitution e=0.5 ,the value of x is

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