Jonathan who is 60 kg driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the break to avoid hitting it. His...

Jonathan who is 60 kg driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the break to avoid hitting it. His seat belt brings his body to stop in 0.40 seconds.a.) What average force does the seat belt exert on him?b.) If he is not strapped to his seat belt and the windshield stops his head in 0.001, what average force would the windshield exert on him?