# Frequency is?

A mass $$M$$ is in static equilibrium on a massless vertical spring as shown in the figure. A ball of mass $$m$$ dropped from certain height sticks to the mass $$M$$ after colliding with it. The oscillations they perform reach to height 'a' above the original level of scales and depth 'b' below it. Which of the following option is correct regarding the oscillation frequency

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