Q 11-13-015NEETJEE MainMedium
A particle in SHM is at a displacement of half its amplitude. The fraction of its total energy that is kinetic is
Answer: (A) $\dfrac{3}{4}$
Concept. $\dfrac{U}{E} = \dfrac{x^2}{A^2}$ and $K = E - U$.
Step 1. At $x = \dfrac{A}{2}$. $\dfrac{U}{E} = \dfrac14$, so $\dfrac{K}{E} = \dfrac34$.
Answer. $\dfrac34$ (Option A).
Solution by Sreeraj P, M.Sc Physics