Replying to Phyisics help?!?

i'm a physics newb, and would love it if someone could show me how to do one or both of these problems, or at least show me what formulas to use:

1) A father pulls his daughter on a sled with a constant velocity on a level surface a distance of 10m.  If the total mass of the sled and girl is 35kg and the coefficient of kinetic friction is 0.20, how much work does the father do?

2) A 3.00kg block slides down a plane that is 20 degrees to the horizontal.  If the coefficient of kinetic friction is 0.275, and the distance is 1.50m, what is the net work?

Thanks/mad karma for any help!