Question

A horizontal force of 157 N is used to push a
32.0 kg packing crate a distance of 6.00 m on
a rough horizontal surface.
The acceleration of gravity is 9.81 m/s2 .
If the crate moves with constant velocity,
calculate
a) the work done by the force.
Answer in units of J

Answer 1

Have a look at the question before yours:
http://openstudy.com/study#/updates/4f16f04de4b0aeb795f5366c

Figure out what is the direction of motion and the only force in that direction. Then work will be the product of those two.

(Hint: is there any movement in the direction of the gravitational force?)

Answer 2

Work done=Force.distance traveled in the direction of force, so 157N.6m=942Nm. right?

Answer 3

http://www.physicsclassroom.com