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A ball is projected upward at time t=0.0s, from a point on a roof 80m above...

A ball is projected upward at time t=0.0s, from a point on a roof 80m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 31.1m/s if air resistance is negligible. the time when the ball strikes the ground is closest to:

A) 7.8 s

B) 8.9 s

C) 8.6 s

D) 8.3 s

E) 8.0 s

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