Body of mass moves to the right with speed and body of mass moves to the left with speed

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

Problem

Body

P

of mass

4\,\text{kg}

moves to the right with speed

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

and body

Q

of mass

3\,\text{kg}

moves to the left with speed

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

. They collide directly and the coefficient of restitution is

0.60

. What is the percentage loss of the system’s kinetic energy due to the collision? (a) 65 \% (b) 55 \% (c) 45 \% (d) 84 \%