Energy, work and power — practice question

A man exerts a force of $40\,\text{N}$ to move a box across the floor. What power is needed to move the box $4.0\,\text{m}$ in $3.0\,\text{s}$?

• A$3.3\,\text{W}$
• B$30\,\text{W}$
• C$53\,\text{W}$
• D$480\,\text{W}$