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10 problems. P1: 'Perfectly inelastic: 4kg at 6 m/s hits 2kg at rest. Combined velocity = ___ m/s' (4). P2: 'KE before = ___ J' (72). P3: 'KE after = ___ J' (48). P4: 'KE lost = ___ J' (24). P5: 'Elastic: 3kg at 4 m/s hits 3kg at rest. First ball velocity after = ___ m/s' (0). P6: 'Second ball veloc
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