# Physics

A stone is thrown upward from a bridge at a speed of 10 m/s. It narrowly misses the
bridge on the way back down, and hits the water at 30m/s. what is the approximate height of the bridge?

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30^2=10^2+2(-9.8)(d)
900=100+(-19.6)d
800=-19.6d
d=40.8

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