1. The problem statement, all variables and given/known data A carpenter is holding two tool boxes of mass 19kg and 21kg respectively. Calculate the work done to carry the tool boxes through a horizontal distance of 16m. 2. Relevant equations W = mgh 3. The attempt at a solution m = 21kg + 19kg g = 9.81ms^-2 h = 0 W = (21 + 19)(9.81)(0) W = 0J Is this correct? And if this is correct, would you explain why it is 0J?