Power

Average: $$ P_{\mathrm{avg}} = \frac{W}{\Delta t} $$
Instantaneous: $$ P = \frac{dW}{dt} = \vec{F} \cdot \vec{v} $$
Power is rate of work done. Instantaneous power is dot product of force $$\vec{F}$$ and instantaneous velocity $$\vec{v}$$. Units: watt (W).