A 33.1 kg sled starts at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is μk = 0.194. A man pulls the sled a distance 7.83 m along the ground by exerting a constant force of magnitude 236 N on a rope that makes a 27.3o angle above the horizontal. Find:
a) the magnitude of the normal force exerted by the ground on the sled.
b) the total work done by the man
c) the work done by the frictional force on the sled