Free Fall: A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 58.5 m/s. Consider all quantities as positive in the upward direction. At time t = 5.97 s, the vertical velocity of the ball is closest to
A. 0 m/s.
B. +175 m/s.
C. +12 m/s.
D. -175 m/s.
E. -12 m/s.
Answer: A
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A) 0.15% B) 1.5% C) 15% D) 50%
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