In the arrangement shown mass m is released from rest with the spring unstretched . The force constant of spring is K. The maximum extension in the spring

Question

$$(a)\;x_m=\frac{2mg}{k} \quad (b)\;x_m=\frac{mg}{k} \quad (c)\;x_m=\frac{mg}{2k}\quad (d)\;x_m=\frac{k}{2 mg}$$