Posted by **R** on Monday, September 19, 2011 at 11:46pm.

A stone falls from rest from the top of a cliff.

A second stone is thrown downward from the

same height 3.3 s later with an initial speed of

64.68 m/s. They hit the ground at the same

time.

The acceleration of gravity is 9.8 m/s2 .

How long does it take the first stone to hit

the ground?

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