Physics

Problem

0.5\,\text{kg}

ball

A

moves with speed

6\,\text{m\,s}^{-1}

along a smooth track towards an identical stationary ball

B

. The collision between

A

and

B

is perfectly elastic. Ball

B

then continues to strike an identical stationary ball

C

in another perfectly elastic collision. What is the kinetic energy of ball

C

immediately after it is struck by

B

? a)

18\,\text{J}

4.5\,\text{J}

9\,\text{J}

36\,\text{J}