Boat A and Boat B have the same mass. Boat A’s velocity is three times greater than that of Boat B. Compared to the kinetic energy of Boat B, the kinetic energy of Boat A is

Kinetic energy is calculated as KE = ½mv². Since the boats have the same mass and Boat A’s velocity is three times Boat B’s, Boat A’s kinetic energy is 3² = 9 times as great. The correct choice is nine times as much.

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