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For instance, I took a simple problem and my answer was off quite a bit..

Problem was "If a static coefficient of static friction between a dresser and the floor is 0.45, what is the magnitude of minimum horizontal force needed to move a dresser of 28kg."

F = .45(9.8)(28)

Simple enough.. my answer was 123.48N

I look at the answer and it's 120N.

How and Why did they round like that?? Thanks.