Struck from behind, a 950-kg stopped car accelerates from rest to 40km/h in 75 ms. Typically, a person's head makes up 6.0% of their body weight. Assume human's mass is 65kg .
Part A What horizontal force on the head would accelerate it along with the rest of the body? Express your answer in newtons.
Part B Express your answer as a multiple of the head's weight.