MCQ
For a simple pendulum, a graph is plotted between its kinetic energy $(KE)$ and potential energy $(PE)$ against its displacement $d$. Which one of the following represents these correctly? (graphs are schematic and not drawn to scale)
- A
- B
- C
- ✓
✓
Answer
Correct option: D.
d
$\mathrm{K} \cdot \mathrm{E}=\frac{1}{2} k\left(A^{2}-d^{2}\right)$
$\mathrm{K} \cdot \mathrm{E}=\frac{1}{2} k\left(A^{2}-d^{2}\right)$
and $\mathrm{P.E.}=\frac{1}{2} k d^{2}$
At mean position $d=0 .$ At extremes positions $d=\mathrm{A}$
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