Student A of mass and Student B of mass stand on identical

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

Problem

Student A of mass

40\,\text{kg}

and Student B of mass

60\,\text{kg}

stand on identical, friction-free roller skates. Starting from rest, they push each other apart. After the push, Student A moves east with a speed of

1.5\,\text{m/s}

. What is the speed and direction of Student B immediately after the push? (a)

1.22\,\text{m/s}

toward the west (b)

1.0\,\text{m/s}

toward the west (c)

2.25\,\text{m/s}

toward the west (d)

1.0\,\text{m/s}

toward the east