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Weight and height. The potential energy of an object is its weight times its height. The potential energy is turned into kinetic energy as the object is dropped.

Potential energy is weight times height, kinetic energy is one half mass times velocity-squared.

Mgh = ½ M V^2

To reach a speed of 10 m/s this equation can be solved to show that the object must be dropped through a height of 5.1 metres.

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