A boat travels east relative to the water of a river that flows in the same direction

PHYSICS · Single correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

A boat travels

5.0\,\text{m/s}

east relative to the water of a river that flows in the same direction. An observer on a bridge measures the boat’s speed as

24\,\text{km/h}

east relative to the ground. What is the speed of the river’s current relative to the ground? (a)

42\,\text{km/h}

east (b)

6\,\text{km/h}

west (c)

6\,\text{km/h}

east (d)

9\,\text{km/h}

east