# Is Work done when there is constant velocity?

## Homework Statement

"You carry your 14.0 kg bag of textbooks horizontally 1.8 m above the ground, at constant velocity for a distance of 25 m. Ignore wind resistance. How much work do you do on the bag in the process?"

W=Fd
F=ma

## The Attempt at a Solution

If work equals force times distance, and force is equal to mass times acceleration, wouldn't the whole thing equal zero because of the constant velocity = no acceleration?

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Doc Al
Mentor
If work equals force times distance, and force is equal to mass times acceleration, wouldn't the whole thing equal zero because of the constant velocity = no acceleration?
The net force on the bag is zero. But what force do you exert and what work does that force do?

....If work equals force times distance....
W=∫F.ds
use that along with what Doc Al suggested. So is there only work being done in the vertical direction, aka. the force is takes you to physically hold the bag up?

If there's displacement in that direction, yes. Work is proportional to displacement.