Q1. In a head-on collision, a car stops in 0.14 from the speed of 24. The driver has a mass of 71, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt throughout that fraction of a second?

Q2. A 67.3 kg sled starts at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is μk = 0.202. A man pulls the sled a distance 5.07 m along the ground by exerting a constant force of magnitude 532 N on a rope that makes a 28.2o angle above the horizontal. Find-

a) magnitude of the normal force exerted by the ground on the sled

b) total work done by the man

c) work done by the frictional force on the sled

d) speed of the sled after it has moved 5.07 m

e) rate at which the man is doing work after the sled has moved 5.07 m