Question

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

Answer 1

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.