1. The problem statement, all variables and given/known data You hold a 500N barbell 0.5m above a level floor for 100s . During this time, the amount of work you do on the barbell is A 1000J B 0J C 500J D 50000J 2. Relevant equations W = Fdcos(phi) 3. The attempt at a solution F= 500 N d = 0.5 m Since the difference in the vector direction is 0, I thought that all you had to do 500*0.5 = 250 J because cos(0) equals 1. But the answer is zero and I don't understand why.