Final answer:
Watt-hour is not a unit of work; it is a unit of energy representing power consumption over time, unlike newton meter, joule, or kilogram-meter, which are actual units of work.
Step-by-step explanation:
The question asks which of the following is not a unit of work. The units that represent work and energy include newton meter, joule, and kilogram-meter, because work is defined as a force applied over a distance. The correct unit that is not a unit of work among the options provided is watt-hour. Watt-hour is a unit of energy representing the power consumption over time, used primarily for measuring electrical energy in practical applications, such as on electricity bills. A watt is the rate of energy conversion equivalent to one joule per second.
Thus, the watt-hour is the unit that is out of place in the list, as it is related to power and energy over time, not the instantaneous accomplishment of work in the physical sense.