A block \( P \) of mass \( m \) is placed on a frictionless horizontal surface. Another block \(...

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A block \( P \) of mass \( m \) is placed on a frictionless horizontal surface. Another block \( Q \) of same mass is kept on \( P \) and connected to the wall with the help of a spring of spring constant \( k \) as shown in the figure. \( \mu_{s} \) is the coefficient of friction between \( P \) and \( Q \). The blocks move together performing SHM of amplitude A. The maximum value of the friction force between \( P \) and \( Q \) is
[IIT-JEE (Screening) 2004]
(a) \( k A \)
(b) \( \frac{k A}{2} \)
(c) Zero
(d) \( \mu_{s} m g \)
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