Relative Motion

Easyphysics

Boat velocity 4 m/s north, current 3 m/s east. Resultant speed magnitude is:

Select the correct option:

5 m/s

7 m/s

1 m/s

4.5 m/s

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About This Question

Subject: physics
Chapter: kinematics
Topic: relative motion
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

5 m/s

The boat's resultant velocity $v_{r}$ is the vector sum of its velocity in still water and the river current velocity. Since North and East are perpendicular: $v_{r} = v_{n or t h}^{2} + v_{e a s t}^{2}$ $v_{r} = 4^{2} + 3^{2} = 16 + 9 = 25 = 5 m/s$ .

This easy difficulty physics question is from the chapter kinematics, covering the topic of relative motion. It appeared in the 2025 exam.

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Relative Motion

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