66. First, we find the speed vof the ball of mass m1right before the collision (just as it reaches its lowest point of swing). Mechanical energy conservation (with h= 0.700 m) leads to 211123.7 m s.2mghmvvgh=¡==(a) We now treat the elastic collision using Eq. 9-67: 1210.5 kg 2.5 kg
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