A stone falls from rest from the top of a cliff a second, Ask an Expert

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A stone falls from rest from the top of a cliff. A second stone is thrown downward from the same height 3.6 s later with an initial speed of 70.56 m/s. They hit the ground at the same time.

How long does it take the first stone to hit the ground? The acceleration of gravity is 9.8 m/s2 . Answer in units of s.

How high is the cliff? Answer in units of m.

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