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A water drop of mass 5 grams drops from rest from the top of a 40...

A water drop of mass 5 grams drops from rest from the top of a 40 m high waterfall. At some point it reaches a terminal speed of 12 m/s and strikes the pool below with that speed. What fraction of its initial total mechanical energy was lost to drag force?

A. 0%

B.18%

C.50%

D.82%

E.100%

Can you please explain why the answer is 82% instead of 12%?

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