Two bodies move along a smooth straight track

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

Problem

Two bodies move along a smooth straight track. Body

A

has mass

2\,\text{kg}

and speed

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

, while body

B

has mass

1\,\text{kg}

and is initially at rest. They collide head-on with a coefficient of restitution

e=0.50

. What is the speed of body

B

immediately after the collision? (a)

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

(b)

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

(c)

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

(d)

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