Physics

Problem

0.40\,\text{kg}

puck slides at

2.0\,\text{m/s}

on frictionless ice toward an identical puck at rest. The coefficient of restitution for the head-on collision is

e = 0.50

. What percent of the system’s initial kinetic energy is lost during the collision? a) 25\% b) 75\% c) 37.5\% d) 50\%