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December 22, 2014

December 22, 2014

Posted by **janie** on Saturday, February 13, 2010 at 7:23am.

(a) Find the mass of the box. kg

(b) Find the coefficient of kinetic friction between the box and the floor.

- physics -
**bobpursley**, Saturday, February 13, 2010 at 8:15amNet force= m*a

75-friction=m*.55

85-friction=m*.78

subtract the first equation from the second

10=m(.23)

m= 10/.23

then solve for friction in either equation, finally, mu=frictionforce/mg

- physics -
**janie**, Saturday, February 13, 2010 at 8:35amthank you

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