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the question is

Dr. Silverstein is driving a 1.95 * 10^3 kg car at 55.0Km/hr. He slams on the brakes and comes to rest in a distance of 17.0 m Assume that Dr. Silverstein has a mass of 75.0 kg

a) what is the cars acceleration, assuming forward is positive?

b) what is the force of friction acting on the wheels of the car? ( hint, what is the mass that is being stopped?)

c) Assuming Dr.Silverstein is well buckled in, what is the force that his seat belt exerts on him?

these three questions i don't understand...my professor give homework pretty easy questions..but not these..plz help me

thank you in advance..