An automobile A of mass 3700 kg travelling at 10 m/s collides head-on with an automobile B of mass 1700 kg initially at rest. (a) What is the modulus of their joint velocity after the collision? (b) If the collision lasts 0.17 s, what is the modulus of the average force acting on each vehicle? (c) Calculate the modulus of the force exerted by the seatbelt on a 71 kg passenger in each car. (It is assumed that the passenger is held firmly by the seatbelt.)