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An ice-skaters of mass 70 kg is moving to the right with a speed of 20...

An ice-skaters of mass 70 kg is moving to the right with a speed of 20 m/s. She bumped into a 62kg ice-skater moving in opposite direction at 13 m/s. Both hold on to each other after the collision. Determine: A) Their final velocity B) the fraction of the initial energy lost

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