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a 2 kg object is moving east 3 m/s. It collides with a 10 kg object...

a 2 kg object is moving east 3 m/s. It collides with a 10 kg object moving west 5 m/s. after the collision, the 2 kg moves west with velocity of 5 m/s. A.) what is the velocity of the 10 kg after the collision? B.) Show that kinetic energy is not considered.
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