A carabao pulls with a horizontal force F on a plow of mass M

A carabao pulls with a horizontal force F on a plow of mass M. The carabao and the plow are traveling at a constant speed v on level ground. How much work is done by the mule on the covered wagon during time ?t? (Use acceleration due to gravity g = 10 m/s^2)

a. - Fv?t

b. 0 J

c. -Fv/?t

d. Fv?t

The potential energy of a pair of interacting objects is related to their,

a. momentum

b. velocity

c. acceleration

d. relative position

The metric unit of a Joule (J) is a unit of *

a. potential energy and displacement

b. kinetic energy and force

c. work and energy

d. kinetic energy and spring constant