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  1. 1. Original momentum = m1v1=0.45X1=0.45kgms^-1 2. By the law of conservation of momentum 0.45 =(0.45+0.01)v2 therfore, v2=0.978ms-1 3. KE of boat = 0.5X0.45X(0.978)^2= 0.215J completed.

  2. ...bottom and narrowing towards the top — but this is incorrect. Only drops of water dripping from some sources are tear-shaped at the moment of formation...