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10 problems. P1: 'A 3kg ball at 4 m/s hits a 2kg ball at rest. They stick together. Combined velocity = ___ m/s' (2.4). P2: 'A 5kg cart at 6 m/s hits a 3kg cart at 2 m/s (same direction). They couple. Final velocity = ___ m/s' (4.5). P3: 'A 4kg ball at 5 m/s hits a 4kg ball at rest. First ball stops

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