A motorboat is moving due east on a calm river

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

Problem

A motorboat is moving due east on a calm river. A stationary observer on the shore measures a floating log to drift 2 m/s east relative to the shore. An observer on the boat measures the log to move 6 m/s west relative to the boat. What is the speed of the boat relative to the shore? (a) 4 m/s west4\ \text{m/s west} (b) 8 m/s west8\ \text{m/s west} (c) 8 m/s east8\ \text{m/s east} (d) 4 m/s east4\ \text{m/s east}

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