# It Takes 6's for a Stone to Fall to the Bottom of a Mine Shaft How Deep Is the Shaft?

The starting velocity is always 0m/s, the acceleration is 9.81m/s (as it is for all objects falling on Earth), and the time taken is 2.5s. Take down to be positive. Therefore: s = displacement, u = initial velocity, v = final velocity, a = acceleration, t = time taken. s = ut + 0.5at² s = (0 * 6) + (0.5 * 9.81 * 6²) s = 0 + 176.58 s = 176.58 The shaft is 177m deep.
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