Physics

Problem

2\,\text{kg}

puck slides to the right at

3\,\text{m}\!/\!\text{s}

while a

1\,\text{kg}

puck slides to the left at

1\,\text{m}\!/\!\text{s}

on a nearly frictionless surface. Taking rightward as the positive direction, determine the velocity of the center of mass of the two-puck system.