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The kinetic energy of a moving object is calculated with the formula E = ½ M v ^2.

So to calculate the KE of a 1000-kilogram car moving at 20 metres per second (45 mph) the formula works like this:

KE = ½ x 1000 x 20^2 Joules = 500 x 400 Joules or 200,000 J.

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