1. A 120kg sleigh is pulled by one horse at a constant velocity for a distance of 0.75km on a level snowy surface. The coefficient of kinetic friction between the sleigh and the snow is 0.25. (a) calculate the work done by the horse. (b) calculate the work done by friction. 2. F= W * S 3. I really have no idea where to start. Thats all i really want to know. Any hints please?