Physics

Problem

A spring with force constant

200\,\text{N m}^{-1}

is initially stretched by

0.10\,\text{m}

. It is then allowed to contract until its extension is

0.04\,\text{m}

. Neglecting non-conservative forces, the work done by the spring force during this motion is a)

+0.36\,\text{J}

+0.84\,\text{J}

-0.84\,\text{J}

+1.00\,\text{J}