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10 problems. P1: 'A 2kg ball is dropped from 5m. Speed at ground = ___ m/s' (10). P2: 'A 3kg ball is thrown up at 12 m/s. Maximum height = ___ m' (7.2). P3: 'A roller coaster car (500kg) starts at 20m height from rest. Speed at the bottom = ___ m/s' (20). P4: 'Same car, what speed at 15m height? ___

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