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**A factory worker pushes a crate of mass 28.5 kg a distance of 4.70 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.25.**

What magnitude of force must the worker apply?

How much work is done on the crate by this force?

How much work is done on the crate by friction?

What magnitude of force must the worker apply?

How much work is done on the crate by this force?

How much work is done on the crate by friction?

I know I have to use the equation W=[tex]\vec{F}[/tex]*[tex]\Delta[/tex][tex]\vec{r}[/tex] for work. Then work gravity = mghcos0 and i got wgravity=4.7*28.5*9.8=1312.7 and i know thats wrong. Can someone please help me with this?

thanks