This apparatus can be used to test the hypothesis that T, the time taken for a ball to roll down a plane from rest, is related to the distance s by the formula T² = ks, where k is a constant.

The ball is timed using a stopwatch over two different values of s.
Suggest problems with the experiment and how they might be overcome. You should consider problems in measuring the distance as well as the time. Also note what happens to the ball; it may not roll in the way that you expect.

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S Figure P1.20