Question

A loop 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.
A. 8 J
B. 16 J
C. 6 J
D. 4 J

Answer 1

Correct Answer - C
( c) `KE` of loop `= mv^2 = 8 J`
`KE` of disc `= (3)/(4) mv^2 = (3)/(4) 8 = 6 J`.