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Well, if you do that for a while, you could certainly raise a sweat, and you would say

that you've done a lot of work. But in the strict Physics definition of "work", none of

it has been done to the object you carried.

The strict definition is: Force acting through a distance.

Referring to the object you carry:

-- You don't move it vertically. You just hold it there against the force of gravity,

but your vertical force doesn't move it up or down. So no work is done vertically.

-- Horizontally, the speed is constant. No force is required to maintain a constant

speed, so no work is done horizontally either.

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