A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be:

2 Mg/k 4 Mg/k Mg/2k Mg/k

Mg/k

ka = Mg a = \(\frac{Mg}{k}\)