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7-57 A 1000-kg car and a 2000-kg truck are each moving at 20 m s-! when they collide head on. Find their final velocities just

7-57 A 1000-kg car and a 2000-kg truck are each moving at 20 m s-! when they collide head on. Find their final velocities just after the colli- sion, (a) if the collision is elastic; (b) if they re- main locked together

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