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The velocity changes from [ V upward ] to [ V downward ].

The total change in velocity is [ 2V ].

Acceleration = (change in velocity) divided by (time for the change) = 2V/6

But the acceleration is just the acceleration of gravity = 9.8 meters / sec2 .

9.8 = 2V / 6

2V = 58.8

V = 29.4 meters per second upward

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