A rowboat can move at relative to still water

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

Problem

A rowboat can move at

2.5\,\text{m/s}

relative to still water. The river current flows due east at

1.0\,\text{m/s}

. If the rower points the boat due north relative to the water, what is the magnitude of the boat’s velocity relative to the ground? (a)

3.5\,\text{m/s}

(b)

1.5\,\text{m/s}

(c)

2.7\,\text{m/s}

(d)

2.5\,\text{m/s}