Question

A disk and a ring of the same mass are rolling to have the same kinetic energy. What is ratio of their velocities of centre of
mass
(1). (4:3)/2
2). (3:4)1/2
(3). (2)1/2:(3)1/2
(4). (3)1/2:(2)1/2
​

Answer 1

mass of disc =mass of ring

kinetic energy of disc =kinetic energy of ring

1/2intomass of disc into (velocity of disc)

*2upon 1/2intomass of ring into (velocity of ring) *2

(velocity of disc) *2 upon ( velocity of ring)*2