Free Fall: A ball is projected upward at time t = 0 s, from a point on a flat roof 90 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 80.5 m/s. Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is 89 m above the ground is closest to
A. -81 m/s.
B. -64 m/s.
C. -48 m/s.
D. -32 m/s.
E. -97 m/s.
Answer: A
Physics & Space Science
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