A student pushes a crate across a rough horizontal floor with a constant force of

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

Problem

100\,\text{N}

. The frictional force opposing the motion is

20\,\text{N}

. If the crate is moved

10\,\text{m}

8\,\text{s}

, calculate the power with which the student does useful work on the crate.