Solution

$K.E. = \frac{1}{2}m\omega^2 A^2 \cos^2\omega t$ (oscillation starts from the extreme position) K.E. is always non-negative and varies as $\cos^2\omega t$, so it repeats twice in one time period (period of K.E. = $\frac{T}{2}$).

Oscillations in past papers

63 questions from this chapter have appeared across 26 exam years.