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Physics

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A stone is dropped from the top of a building and hits the ground 5 seconds later. (a) how tall is the building? (b) what is its velocity after 5 seconds?

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y = 0 when t = 5

(a) y - (y0) = (v0)t + (1/2)gt²

0 - y0 = 0*5 + 0.5(-9.8)(5²)

y0 = 490 m

(b) v - v0 = gt

v - 0 = -9.8*5

v = -49 m/s

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