A 49.7 kg sled starts at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is ?k = 0.247. A man pulls the sled a distance 5.08 m along the ground by exerting a constant force of magnitude 430 N on a rope that makes a 28.4o angle above the horizontal. Find:
a) the magnitude of the normal force exerted by the ground on the sled
N
b) the total work done by the man
J
c) the work done by the frictional force on the sled
J
d) the speed of the sled after it has moved 5.08 m
m/s
e) the rate at which the man is doing work after the sled has moved 5.08 m
W