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A ball thrown upward from the top of a t...

A ball thrown upward from the top of a tower with speed `v` reaches the ground in `t_(1)` sec. If this ball is thrown downward from the top of the same tower with speed `v` it reaches the ground in `t_(2)` sec. In what time, the ball shall reach the grouned, if it is allowed to fall freely under gravity from the top of the tower?

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