Balls 1 and 2 move along a smooth horizontal plane along one straight line. The first ball has mass m1 = 0.5 kg and speed v1 = 10 m/sec, and the second ball has mass m2 = 1 kg and speed v2 = 5 m/sec. After the first ball catches up with the second, an impact occurs and the speed of the first ball decreases to the same value as the speed of the second ball after the impact?
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