Two identical particles \( A \) and \( B \), each of mass \( m \), ...

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Two identical particles \( A \) and \( B \), each of mass \( m \), are interconnected by a spring of stiffness \( k \). If the particle \( B \) experiences a force \( F \) \& the elongation of the relative
\( \mathrm{P} \) spring is \( x \), the relative acceleration between the particles is equal to:
(A) \( F / 2 m \)
(B) \( \frac{\mathrm{F}-\mathrm{kx}}{\mathrm{m}} \)
(C) \( \frac{F-2 k x}{m} \)
(D) \( \frac{\mathrm{kx}}{\mathrm{m}} \)
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