posted by Demere on .
Suppose a 1,600 kg car is traveling at 20.0 m/s. What average force is needed to stop the car in 4.0 s? Can you explain to me how you got your answer, thank you.
(Avg. Force)*(time) = Momentum change
= 1600*20 kg m/s
Avg. Force = 32,000/4.0 = 8000 Newtons