A car C drives east relative to a truck T

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

Problem

A car C drives

7\,\text{m/s}

east relative to a truck T. The truck moves with an unknown speed relative to a bus B. The bus travels

15\,\text{m/s}

east relative to the ground G. If an observer on the ground measures the car’s speed to be

2\,\text{m/s}

west, what is the truck’s speed relative to the bus? (a)

24\,\text{m/s}

east (b)

9\,\text{m/s}

west (c)

24\,\text{m/s}

west (d)

6\,\text{m/s}

west