1. A father (mFÂ =75 kg) and his daughter (mDÂ =35 kg) stand on a flat, frozen lake of negligible friction. They hold a 10-mlong rope stretched between them. The father and daughter then pull the rope to bring them together. If the father is initially standing at the origin, how far from the origin will they meet?
2. Twin brothers, each of mass 50 kg, sit in a symmetric canoe of mass 40 kg. Each boy sits 1.5 m away from the center of the canoe as they toss a basketball (mass =0.60 kg) back and forth. (a) How much does the center of the canoe move as the ball moves from one brother to the other? (b) How much would the canoe shift on each throw if instead they used a medicine ball of
mass 11 kg?
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