A Solid Sphere and a Hollow Sphere Each of Mass

A solid sphere and a hollow sphere each of mass M and radius R are released at the same time from the top of an inclined plane. Which one of the following statements is necessarily true?

A) The solid sphere will reach the bottom first.
B) The hollow sphere will reach the bottom first.
C) Both spheres will reach the bottom at the same time.
D) The solid sphere will reach the bottom with the greater kinetic energy.
E) The hollow sphere will reach the bottom with the greater kinetic energy.

Correct Answer:

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