Posted by **Mochool** on Wednesday, November 16, 2011 at 9:55pm.

A 34-pound crate is pushed across the floor by

a 30-pound horizontal force F1. Aside from

the pushing force and gravity F2, there is also

a 34-pound force F3 exerted upward on the

crate and a 20-pound frictional force F4

What kinds of work do the force F1, F2, F3,

F4 do, respectively?

1. +, 0, 0, 0

2. +, 0, 0, −

3. +, +, 0, 0

4. −, +, −, +

5. +, −, +, −

6. +, 0, +, 0

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