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16-09-2017
Physics

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A science student drops a rock a mine shaft. If it takes 3.0 seconds for the rock to hit the bottom of the shaft, what is the speed of the rock just before impact? (Acceleration of the falling object is 9.8 m/s^2

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16-09-2017

Anything that is dropped and falls for 3 seconds without air resistance is falling at (9.8 x 3) = 29.4 m/s at that moment.

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