Physics

Problem

A horizontal spring with force constant

200\,\text{N/m}

is compressed

0.15\,\text{m}

and then released so that it returns to its equilibrium length. Neglecting friction, what is the change in the spring’s potential energy

\Delta U_{\text{spring}}

between the instant just before release and the instant it passes through equilibrium? a)

+2.3\,\text{J}

0\,\text{J}

-2.3\,\text{J}

-4.5\,\text{J}