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i found out the work done by pulling force is 1669 J and its asking for the work done by the kinetic frictional force!

here's what i did but the answer is wrong though...i tried a million times and it's still wrong! i know something's wrong here and i know it's not the acceleration of gravity or m...hmm

i did

mg times mu=9.8*90*.2

then i times it by the distance to get work. 176.4N*6m=1058.4 J

which is WRONG! arghh.......am i missing something here? :rofl: