# Physics

. A stone is dropped from the top of a building that is 500m high. Disregarding air resistance how long does it take the stone to reach the ground?

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1. Use kinematics equation:

Δx = vi(t) + (1/2)at²
vi=0
g=-9.8
-500=(1/2)(-9.8)t²
t=√(2(-500)/(-9.8))
=10.1 s (approximately)

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