Which one of the following equations of motion represents simple harmonic motion ? where k, k0, k1 and a are all positive.

Question

Which one of the following equations of motion represents simple harmonic motion ?

where k, k₀, k₁ and a are all positive.

Acceleration = $-$ k (x + a)

Acceleration = k(x + a)

Acceleration = $-$ $\omega $²x

Acceleration = $-$ k₀x + k₁x²

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