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A body moves 30 m east in 5 s and then 10 m west in 5 s. What is its average velocity over the entire 10 s interval?
A4 m/s east
B2 m/s east
C4 m/s west
D0 m/s
Answer & Solution
Correct answer: B. 2 m/s east
Net displacement $=30-10=20$ m east. Total time $=10$ s. Therefore average velocity $=\frac{20}{10}=2$ m/s east. A common mistake is to divide total distance 40 m by time, which would give average speed, not average velocity.
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