The formula f = ma lets us work out the force f at work on an object with a mass of m kilograms (kg) and an acceleration of a meters per second squared (m/s2). What is the unit for force?
a. kg-s^2/m
b. kg-m-s^2
c. kg-m
d. kg-m/s^2
a. kg-s^2/m
b. kg-m-s^2
c. kg-m
d. kg-m/s^2