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A 2.0 kg mass moving to the east at a speed of 4.0m/s collides head on...

A 2.0 kg mass moving to the east at a speed of 4.0m/s collides head on in a comletely inelastic collision with a 2.0 kg mass moving west at 2.0m/s. How much kinetic energy is lost during this collision?

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