m = 8 kilograms is the mass of a bucket of water that was raised from the well;
A = 640 Joules – the work done to lift the bucket.
It is required to determine h (meter) – the depth of the well.
We will assume that the water from the well was raised evenly, that is, at a constant rate. Then:
A = F gravity * h = m * g * h, where g = 10 Newton / kilogram is an approximate value;
h = A / (m * g);
h = 640 / (8 * 10) = 640/80 = 8 meters.
Answer: the depth of the well is 8 meters.
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