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## Homework Statement

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.

## Homework Equations

W = mgh

## 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?