A particle moving along the X-axis, executes simple harmonic

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A particle moving along the X-axis, executes simple harmonic motion then the force acting on it is given by

1. – A kx
2. A cos (kx)
3. A exp (– kx)
4. Akx
  where, A and k are positive constants.

Correct Option: A

For simple harmonic motion, F = – Kx.
Here, K = Ak.