Question

The system shown in figure is released from rest with spring at natural length. The spring starts extending as soon as it is
released if (Neglect friction and masses of pulley, string and spring)​

Answer 1

For any value of M, the spring will be elongated.

Explanation:

Note: The diagram is missing in the question and hence the question is incomplete. Please find attached the required diagram of the spring.

If the spring system is released from rest, then neglecting friction and mass of the pully, string and spring, the spring will elongate for any value of M.

a = Mg / (M+2m).

We find that a is less than g. So there will be an upward force on M.

So for any value of M, the spring will be elongated.