A Ball Is Projected Upward at Time T = 0

question 303

Multiple Choice

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) +12 m/s.
• C) -12 m/s.
• D) -175 m/s.
• E) +175 m/s.

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