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If a car moving at a speed of 50 km/h has a kinetic energy of x, what kinetic energy will it have when moving at 100 km/h?

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As it is the same car in the equation Ek = 1/2 m v^2
Then 1/2m is constant and can be removed.
Therefore doubling v and v being squared gives a solution of Ek=4x.

Hope that helps. 

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