Which of these has the most kinetic energy A. a 25 kg fishtank sitting on a table
B. a 50 g fish swimming in a fish tank
C. a 7500kg car parked on a steep hill
D. a 50 kg boulder suspended from a cliff

A 50 kg boulder suspended from a cliff.

Explanation:

In this case, that totally depends on the velocity of the object, In case of car, that's just parked so the velocity is zero and a fish can't swim with higher velocity than a boulder which is suspended from a cliff.

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