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A boy standing on a stationary lift (ope...

A boy standing on a stationary lift (open from above) throws a ball upwards with the maximum initial speed he can, equal to `49 m s^-1` . How much time does the ball take to return to his hands? If the lift starts moving up with a uniform speed of `5 m s^-1` and the boy again throws the ball up with the maximum speed he can, how long does the ball take to return to his hands ?

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