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.
Share this question
More from Physics
- The focal length of a plane mirror is:
- A step-down transformer has 400 turns in the primary and 100 turns in the secondary. If input voltage is 220V, what is the output voltage?
- Which safety device breaks the circuit when the current exceeds a safe limit?
- Which of the following is a good conductor of electricity?
- One kilowatt-hour (1 kWh) is equal to how many Joules?