The Force to Compress a Nonlinear Spring Is Given By F

Multiple Choice

The force to compress a nonlinear spring is given by $F ( x ) = \gamma x ^ { 2 }$ , where $\gamma = 45,000 \mathrm {~N} / \mathrm { m } ^ { 2 }$ . The amount of energy stored in this spring when it is compressed $10 \mathrm {~cm}$ is

A) 450 J.
B) 220 J.
C) 45 J.
D) 15 J.