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Re: the definition of 'work'
IMO the rock does no work, the water does by eroding the rock over time. With it's force it removes particles from the rock and moves them a distance as a result. The rock only reacts to the energy of the water, not by any energy of it's own. It is like a tennis ball dropped on the concrete. The rebound of the ball is a result of the balls energy, not the concrete's energy.
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Clay
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