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Restoring force, f' = -kx where x is the extension produced in the spring. Weight of the mass acting downward = Mg. In equilibrium, kx = Mg or x = Mg/k.

1. kx = Mg
2. x = Mg/k
3. Restoring force f' = -kx
4. Weight of mass acting downward = Mg

Correct answer: x = Mg/k

Solution

The question asks for the equilibrium condition, which is given by x = Mg/k, derived from balancing the restoring force and the weight of the mass.

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