Inside a train

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

Inside a train, a moving walkway carries luggage. The luggage moves

1.2\,\text{m/s}

forward relative to the walkway. A seated passenger on the train measures the luggage’s speed to be

3.5\,\text{m/s}

forward relative to the train. An observer standing on the platform measures the luggage’s speed to be

7.0\,\text{m/s}

forward relative to the ground. What is the walkway’s speed relative to the ground? (a)

4.7\,\text{m/s}

forward (b)

5.8\,\text{m/s}

forward (c)

3.5\,\text{m/s}

forward (d)

2.3\,\text{m/s}

forward