Physicshard · Past Paper
A wire is stretched by 1 mm by a force of 1 kN. The work done in stretching is:
A1 J
B0.5 J
C1000 J
D500 J
✓ Correct Answer: B — 0.5 J
Work done in stretching a wire = 1/2 * Force * Extension = 1/2 * 1000 N * 0.001 m = 0.5 J.
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