A horizontal spring with force constant is compressed and then released

PHYSICS · Subjective · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

A horizontal spring with force constant

k = 200\,\text{N}\!/\!\text{m}

is compressed

0.15\,\text{m}

and then released, bringing the attached block momentarily to rest again after

0.40\,\text{s}

. Assuming negligible non-conservative forces, compute the average power delivered to the block while the spring returns to its equilibrium length.