Question: A ball is projected upward at time t = 0 . 0 s , from a point on a roof 9 0 m above the

A ball is projected upward at time t =0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 3842 m/s if air resistance is negligible. The time when the ball strikes the
ground is closest to

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