Question: 7. A ball is projected upward at time t = 0.0 s, from a point on a roof 60 m above the ground. The

7. A ball is projected upward at time t = 0.0 s,

7. A ball is projected upward at time t = 0.0 s, from a point on a roof 60 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 71.6 m/s if air resistance is negligible. What is the time when the ball strikes the ground?

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