posted by Ariel .
What average force is required to stop an 1700 kg car in 7.0 s if the car is traveling at 75 km/h?
First change the 75 km/h to 20.83 meters per second
(Average Force)* Time = Momentum change
= 1700 kg * 20.83 m/s
Solve or the Average Force, in Newtons
1700(m/s)*20.83(kg)/7.0(s) = ___? N
In pounds, it's about 2300