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

Multiple Choice

A spring with spring constant k = 800 N/m is extended 12 cm from its equilibrium position. A spring with 6.0 cm extension from equilibrium will have the same potential energy as the first spring if its spring constant is

A) 200 N/m.
B) 400 N/m.
C) 800 N/m.
D) 1 600 N/m.
E) 3 200 N/m.