# Algebra

A rock is thrown upward with a velocity of 14 meters per second from the top of a 20 meter high cliff, and misses the cliff on the way back down. When will the rock be 12 meters from ground level

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1. just solve the height equation:
20 + 14t - 4.9t^2 = 12

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oobleck
2. x=3.528311 or x=-3.528311

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3. 4.96 seconds

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