$A$ body of mass $0.4 \text{ kg}$ performs simple harmonic motion. It experiences a restoring force of $0.4 \text{ N}$ when its displacement from the mean position is $4 \text{ cm}$. The force constant and magnitude of acceleration respectively are
- A$10 \text{ N/m}, 1 \text{ m/s}^2$
- B$5 \text{ N/m}, 0.5 \text{ m/s}^2$
- C$10 \text{ N/m}, 0.5 \text{ m/s}^2$
- D$5 \text{ N/m}, 1 \text{ m/s}^2$
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