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. The weight of the boat is 200 kg and the weight of the fisherman is 70 kg. Just before the pier, the fisherman jumps ashore. At what speed must he jump out of the boat (according to a stationary observer onshore) for the boat to stop in front of the pier?
. The yacht and the boat are now moving in their own directions. Given that the mass of the yacht is 2000 kg, the mass of the boat is 500 kg and the mass of the captain is 70 kg, what are the speeds of the yacht and that of the boat?
and 
. The third part is three times the mass of the other two. At what speed and in which direction is it moving?
. Due to the recoil of the gun, the hunter slides back. By how much does he slide back if the coefficient of friction between his footwear and ice is 0.2?
