The mass of car 2 is twice the mass of car 1. If both cars have the same velocity, how does the kinetic energy of car 2 compare to car 1?

Kinetic energy is calculated with KE = ½mv². Since both cars have the same velocity, the velocity term is the same, so kinetic energy is proportional to mass. Car 2 has twice the mass of car 1, so it has twice the kinetic energy. The correct choice is “Car 2 has twice the kinetic energy.”

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