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A boy throws a ball with speed u in a we...

A boy throws a ball with speed `u` in a well of depth `14 m` as shown in (Fig. 5.191). On bounce with the bottom of the well, the speed of the ball gets halved. What should be thw minimum value of `u( "in" ms^-1)` such that the ball may be able to reach his hands again ? It is given that his hands are at `1 m` height from top of the well while throwing and catching.
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