An Object Is Attached to a Hanging Unstretched Ideal and Massless

Multiple Choice

An object is attached to a hanging unstretched ideal and massless spring and slowly lowered to its equilibrium position,a distance of 6.4 cm below the starting point.If instead of having been lowered slowly the object was dropped from rest,how far then would it then stretch the spring at maximum elongation?

A) 13 cm
B) 9.1 cm
C) 6.4 cm
D) 18 cm
E) 26 cm