If a moving car has 100,000J of kinetic energy, what would be the kinetic energy of a truck which is moving at the same speed but has three times the mass of the car?
(A) 100,000J.
(B) 300,000J.
(C) 900,000J.
(D) 33,333J
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(A) 100,000J. --- No.
The truck has more kinetic energy.
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(B) 300,000J. --- Yes.
Total energy is proportional to mass.
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(C) 900,000J. --- No.
Total energy is proportional to mass, not mass squared.
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(D) 33,333J --- No.
The larger truck has more kinetic energy than the car.
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