If a small block of mass m is placed gently on M when it is passing through its mean position. Find it's new amplitude of SHM, if initial amplitude is A.

a}\(\sqrt { M\over M+m}\)(A)

b}\(\sqrt{ M+m\over M}\)(A)

C}\(\sqrt{ M+m\over 2 M}\) (A)

d}\(\sqrt{ M\over M-m}(A)\)