Compute the each part of given problem:
Problem: You are pushing a refrigerator across the floor of your kitchen. You exert a horizontal force of 318 N for 7.2 s, during which time the refrigerator moves a distance of 3.4 m at constant velocity.
Part I: What is the total work (by all forces) done on the refrigerator?
Part II: What is the work done by friction?
Thanks in advance that solve the above problem.