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A 24 kg ball is projected upward at time t=0.0s, from a point on a roof...

A 24 kg ball is projected upward at time t=0.0s, from a point on a roof 66 m above the ground and experiences negligible air resistance. the ball rises, then falls and strikes the ground. the initial velocity of the ball is 10.6 m/s. Consider all quantities as positive in the upward direction. the speed of the ball when it is 39 m above the ground is closest to

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