試題詳解

4. An air-bag company is designing a new product. The specification requires passengers of mass 75 kg to sit in a car traveling at 60 km/h. When the car hits the wall and stops there, the air-bag extends the stopping time up to 0.4 s. What is the average force on the passenger during this collision?
(A) 408 N
(B) 1680 N
(C) 3125 N
(D) 11259 N
(E) 30625 N