Asked by Georgy

A hoodlum throws a rock straight down from the roof of a building 109m high. If it takes 2.40s to hit the ground below, with what initial speed was the rock thrown?

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Answers

Answered by Steve
If thrown down with initial velocity v, then just solve

109 - vt - 4.9t^2 = 0

plug in t=2.40 and find v.
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