$A$ 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

30-6

  • [IIT 2004]
  • A

    $kA$

  • B

    $\frac{{kA}}{2}$

  • C

    Zero

  • D

    ${\mu _s}\,mg$

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