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Best way is visual and constant mass.

KE = 1/2 mV2

KE = 1/2(100 kg)(20 m/s)2

= 20000 joules

==================

80000/20000

= 4 times the kinetic energy by doubling the velocity because the velocity is squared

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Q: Explain how the kenetic energy of an object changes when the speed of the object doubles?
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