In the given figure, a mass $M$ is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is $k$. The mass oscillates on a frictionless surface with time period $T$ and amplitude $A$. When the mass is in equilibrium position, as shown in the figure, another mass $m$ is gently fixed upon it. The new amplitude of oscillation will be

981-728

  • [JEE MAIN 2021]
  • A

    $A \sqrt{\frac{M-m}{M}}$

  • B

    $A \sqrt{\frac{M}{M+m}}$

  • C

    $A \sqrt{\frac{M+m}{M}}$

  • D

    $A \sqrt{\frac{M}{M-m}}$

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