A Spring with Spring Constant K = 800 N/m Is

Multiple Choice

A spring with spring constant k = 800 N/m is compressed 12 cm from its equilibrium position. A spring with spring constant k = 400 N/m has the same elastic potential energy as the first spring when its extension is

A) 0.060 m.
B) 0.085 m.
C) 0.12 m.
D) 0.17 m.
E) 0.24 m.