A boy pulls a 5.0 Kg sled 10.0 m along a horizontal surface at a constant speed. The coefficient of kinetic friction is 0.20 and his pull is 37 degrees above the horizontal.
A.) what work does he do pulling the sled? (that is, what is the work done on the sled by the boy?)
B.) would the boy do more, less, or the same amount of work if he pulled horizontally on the sled?