Physicshard · Past Paper
The work done by a spring force when a spring is stretched from x1 to x2 is:
A1/2 k(x2 - x1)^2
B1/2 kx2^2 - 1/2 kx1^2
C- [1/2 kx2^2 - 1/2 kx1^2]
Dkx2 - kx1
✓ Correct Answer: C — - [1/2 kx2^2 - 1/2 kx1^2]
Spring force is -kx. Integrating -kx from x1 to x2 gives -1/2 k(x2^2 - x1^2).
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