Q. 23

A solid sphere, a hollow sphere and a disc, all having same mass and radius, are placed at the top of a smooth incline and released. Least time will be taken in reaching the bottom by
A. the solid sphere

B. the hollow sphere

C. the disc

D. all will take same time

Answer :

As the plane is smooth (frictionless), the force of gravity is directly acted on the center of mass. The masses of all these bodies are the same. So, all of them are going to take same time.

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