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  4. Assertion: The velocity of a body at the bottom of an inclined plane of given height is more when it slides down the plane, compared to, when it rolling down the same plane. Reason: In rolling down a body acquires both, kinetic energy of translation and rotation.

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Q. Assertion: The velocity of a body at the bottom of an inclined plane of given height is more when it slides down the plane, compared to, when it rolling down the same plane.
Reason: In rolling down a body acquires both, kinetic energy of translation and rotation.

AIIMSAIIMS 2008

Solution:

In sliding down, the entire potential energy of body is converted only into translational energy. While in rolling motion, some part of potential energy is converted into kinetic energy of rotation and rest into kinetic energy of translation. Therefore, in sliding motion, the velocity acquired by the body is more.