Physics

Problem

2\,\text{kg}

puck sliding east at

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

collides with a

3\,\text{kg}

puck that is initially at rest on a frictionless horizontal surface. After the impact, the

2\,\text{kg}

puck moves north at

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

. What is the speed of the

3\,\text{kg}

puck immediately after the collision? a)

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

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

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

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