Posted by **Ariel** on Wednesday, September 8, 2010 at 4:13pm.

What average force is required to stop an 1700 kg car in 7.0 s if the car is traveling at 75 km/h?

- Physics -
**drwls**, Wednesday, September 8, 2010 at 5:35pm
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

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