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Would some object to this sort of question?
A 75kg boater tosses a 5kg anchor horizontally, straight forward across the
bow of his 125kg boat at 2m/s relative to the water. a) Neglecting any
horizontal force applied to the boat by the water, calculate the boat's
backward speed across the water just as the anchor leaves the boater's hand.
(The boat is initially at rest on the water.) b) At least how much work
must the boater have done to throw the anchor in this way?