- #1

Oxygen206

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## Homework Statement

The problem asks, "You lift a 10N book up in the air a distance of 1m at a constant velocity of 0.5m/s. The work done by gravity is:

a. -10J

b.-5J

c. zero

d. 5J

e. 10J

## Homework Equations

W=FD

Wg=mgh

## The Attempt at a Solution

So, the work done by whoever is lifting the book is 10J (W=FD) but with the hand still holding the book, is gravity doing work? I just really can't decide if gravity is doing "work" in this situation. Can someone point me in the right direction? Thank you!