Physics

Problem

0.50\,\text{kg}

puck slides due east at

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

on a nearly frictionless table and collides head-on with a second puck that is moving due west at

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

. After sticking together, the two-puck system moves due east at

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

. What is the mass of the second puck? a)

1.5\,\text{kg}

0.75\,\text{kg}

0.50\,\text{kg}

0.25\,\text{kg}