Question

what is the unit used to express work?
newton meter (n·m or n m)
grams per cubic centimeter (g/cm³)

Explanation:

Work is calculated as the product of force and displacement. Force is measured in newtons (N) and displacement in meters (m). So, the unit for work is newton - meter ($N\cdot m$). Grams per cubic centimeter ($g/cm^{3}$) is a unit for density, not work.

Answer:

newton meter ($N\cdot m$ or $N\ m$)