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A ball is released from the top of a bui...

A ball is released from the top of a building of height `45m` at `t=0` . When the ball strikes the ground, its speed becomes `(2)/(3)` times its original value. The time instant when the ball strikes the ground for the second time is t = ...........sec .`["Take" g=10 m//s^(2) ]`

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