A smooth sphere is moving on a frictionless horizontal plane with angular speed and…

PHYSICS · Single correct · AP · Physics C: Mechanics · Linear Momentum · Linear Momentum

Problem

A smooth sphere

A

is moving on a frictionless 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 everywhere. After the collision, their angular speeds are

\omega_A

and

\omega_B

, respectively. Then (1)

\omega_A < \omega_B

(2)

\omega_A = \omega_B

(3)

\omega_A = \omega

(4)

\omega_B = \omega