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NEET UG PHYSICS MCQ: SYSTEM OF PARTICLES

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A ring and a disc of same mass roll without slipping along a horizontal surface with same velocity. If the K.E. of ring is 4J, then that of disc is

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Correct option: B

3 J

Option B (3 J) is correct. The kinetic energy of a rolling object is the sum of translational and rotational kinetic energies. For a ring,

KE = mv^2

, and for a disc,

KE = (3/4)mv^2

.

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