A Ball Is Projected Upward at Time T = 0 $80.5 \mathrm {~m} / \mathrm { s }$

question 145

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 $80.5 \mathrm {~m} / \mathrm { s }$ Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is $89 \mathrm {~m}$ 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.

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