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A 0.50 kg cart with a velocity of 2.0 meters per second collides with a 1.0...

A 0.50 kg cart with a velocity of 2.0 meters per second collides with a 1.0 kg cart which is motionless. Just after the collision the second cart has a velocity of 1.2 meters per second. (Neglect friction) a) what will be the velocity of the 0.50 kg cart just after the collision? b) what per cent of the original energy is lost in the collision?
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