# A stone is dropped from rest at the top of a mine shaft

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A stone is dropped from rest at the top of a mine shaft. It takes 79 s for a stone to fall to the bottom of a mine shaft.

How deep is the shaft? The acceleration of gravity is 9.8 m/s2 .

Answer in units of m

asked Sep 15, 2014

## 1 Answer

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Motion at constant acceleration with zero initial velocity: $\Delta y=\frac 12gt^2$.
answered Sep 15, 2014 by (21,750 points)