A Ball Is Projected Upward at Time T = 0

question 58

Multiple Choice

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
Consider all quantities as positive in the upward direction.The vertical velocity of the ball when it is
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.

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