Physicsmedium · Past Paper
What is the work done by a person in carrying a 20 kg bag on his head while walking 50 m on a horizontal road?
A1000 J
B9800 J
C0 J
D500 J
✓ Correct Answer: C — 0 J
The force (vertical) is perpendicular to the displacement (horizontal), so the work done is zero.
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