1.____is defined as the reta at which work is done
a. joule
b. power
c.speed
d. mechanical advantage
2.what are the units of work
a. J
b. W
c. m/s
d. kgm/s
3. what are the units of power
a. horsepower
b. joule per s second
c. all the choices are correct
d. watts​