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wet means lubrication. One of those is not wet. There is no difference in pulling or pushing. Think wet, or dry.

Which of the following would require the greatest force to keep a 5.0 kilogram rubber

block moving horizontally at a constant rate of speed?

a. Pushing the block across wet asphalt.
b. Pulling the block across wet asphalt.
c. Pulling the block across wet concrete.
d. Pushing the block across dry concrete.

i don't knw what's the different of pulling and pushing the block...
and i haf calculated that their force of friction..the rubber on wet asphalt is 26.0N...and the rubber on wet concrete is 28.4N...

what do i have to do next?

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