ball is projected upward at time tt = 0.0 s, from a point on a roof 30 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 81.9 m/s. Consider all quantities as positive in the upward direction. At time tt = 8.36 s, the vertical component of the ball's velocity is closest to: A. -342 m/s B.+12 m/s

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Chapter1: Units, Trigonometry. And Vectors
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A ball is projected upward at time tt = 0.0 s, from a point on a roof 30 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 81.9 m/s. Consider all quantities as positive in the upward direction. At time tt = 8.36 s, the vertical component of the ball's velocity is closest to:

A. -342 m/s

B.+12 m/s

C. zero

D. -12 m/s

E.+342 m/s

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