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feddyfuntime

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A flight attendant pulls her 70N flight bag a distance of 253 meters along a level airport floor at a constant velocity. The force she exerts is 40 Newtons at an angle of 52 degrees above the horizontal, find the following:

a. the work she does on the flight bag

b. the work done by the force of friction on the flight bag

c. the coefficient of kinetic friction between the flight bag and the floor.

I think I understand A, which is 6230.5J? But B and C I do not even know where to start, please help? Thanks in advanced.