Asked by elias
a rock is directly thrown upward from the edge of a roof of a building that is 56.3m tall. the rock misses the building on its way down, and is observed to strike the ground 4 seconds after being thrown. with what speed was the rock thrown?
Answers
Answered by
bobpursley
hf=hi+vi*t-4.9t^2
hf=0, hi=56.3, t=4.0
solve for vi
hf=0, hi=56.3, t=4.0
solve for vi
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