Solution:
For simple harmonic motion, the acceleration must be directly proportional and opposite in direction to the displacement. Thus, $a \propto -x$, which matches the equation $\text{Acceleration} = -k(x)$.
Which one of the following equations of motion represents simple harmonic motion? (2009)nwhere $k$, $k_0$, $k_1$ and $a$ are all positive.
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