A Rock Is Moving with Speed V

question 17

Multiple Choice

A rock is moving with speed v.If the mass of the rock were tripled and the speed were reduced to v/3,which of the following statements would be true?

• A)The kinetic energy of the rock is smaller than in the first case,but the momentum is larger.
• B)The kinetic energy of the rock is smaller than in the first case,but the momenta of both are the same.
• C)The kinetic energies of the rocks are the same in both cases.
• D)The kinetic energy of the rock is 1/9 its previous value.

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