Answer:
D. a measure of how fast a machine performs work
Explanation:
Power can be defined as the energy required to do work per unit time.
Mathematically, it is given by the formula;
[tex] Power = \frac {Energy}{time} [/tex]
Hence, the best description of power is that, it is a measure of how fast a machine performs work.
This can be calculated by using the mathematical expression below;
[tex] Power = \frac {Work done}{Time} [/tex]
But we know that, [tex] Workdone = force * distance [/tex]
