Q.

A thin ring and a disc have same mass and roll without slipping with the same linear velocity v. If the total kinetic energy of the loop is 8 J, the kinetic energy of the disc must be

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a

16 J

b

4 J

c

6 J

d

8 J

answer is C.

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Detailed Solution

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During rolling total KE of loop = mv2 = 8 J

 Total KE of disc = 34mv2 = 348 = 6 J

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