50 L of water falls 10.0 m into the bucket of a water wheel. How much energy is imparted to the wheel?

1 L of water has a mass of 1 kg, so the potential energy of 50 L of water 10 metres above the bucket is:

50*1*9.8*10 Joules = 4900 Joules

This is turned into the same amount of kinetic energy as it hits the bucket.

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Thanks Alan, I am learning/revising too.

Potential energy = mass* gravity * height

[mass kg] [ gravity m/s^2] [ height m] Energy is measured in Joules