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The system as shown is released from rest. Neglecting friction and masses of pulleys, spring & rope the spring gets elongated if

1 Answer

For the mass M
Net force on the system $Mg-mg+mg$
Total mass being pulled $=M+2m$
Therefore $ a=\large\frac{Mg}{M+2m}$
We have $a < g$
There should be an upward force on M. so that its acceleration becomes less than g. Hence for any value of M spring is elongated
answered Jul 8, 2013 by meena.p

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