A smooth sphere A is moving on a frinctionless horizontal plane with angular speed `omega` and centre of mass velocity v. It collides elastically and head on with an identical sphere B at rest. Neglect friction every where. After collision, their angular speeds are `omega_(A)` and `omega_(B)` respectively. Then :

Options

A. `omega_(A)gtomega_(B)`
B. `omega_(A)=omega_(B)`
C. `omega_(A)=omega`
D. `omega_(B)=omega`

Answer

C

Explanation

The angular speed of A will remain unchanged as during the contact of two balls, the rotational motion is not shared.