A car moving at 8.5 m/s crashes into a tree and stops in 0.32 s. Part (a) Calculate the magnitude of the force, in newtons, the seatbelt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 77 kg. F=........ Part (b) What would the final velocity be, in meters per second, if the car with the 77-kg passenger had collided with (and stuck to) a car that has an equal mass and is traveling in the opposite direction and at the same speed? I need each and every step with proper explanation