. The period of the free oscillations of the system shown here

if mass M1 is pulled down a little and force constant of the spring is k and masses of the fixed pulleys are negligible, is 


Best Answer

Ans: C

Sol: If the mass M1 is displaced by x and has speed v, spring will extend by x/2 and M2 will have speed v/2

Energy of this system can be written as


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