A ball moves east with momentum and strikes a ball initially at rest on a…

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Linear Momentum · Linear Momentum

Problem

1.0\,\text{kg}

ball moves east with momentum

4\,\text{kg\,m\,s}^{-1}

and strikes a

2.0\,\text{kg}

ball initially at rest on a frictionless table. After a perfectly elastic collision, the

1.0\,\text{kg}

ball is seen to move at

60^{\circ}

north of east with speed

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

. Approximately what speed does the

2.0\,\text{kg}

ball acquire immediately after the collision? (a)

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

(b)

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

(c)

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

(d)

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