Physics

Problem

A billiard ball A of mass

150\,\text{g}

slides on a frictionless table with speed

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

and strikes an identical stationary ball B. After an elastic collision ball A is observed to move at

30^{\circ}

to its original direction. The speed of ball B immediately after the collision is closest to a)

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

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

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

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