Car Braking: Calculating Acceleration from Applied Force

[msimard8]

A 2.5 x 10^3 kg car os traveling due west at 30m/s when the brakes are applied, exerting a force of 5.0 x 10^3 [E]. What is the cars acceleration due to braking?

umm I do not know how to do this but i do know Net Force = ma. Thus Fapp - Ffric = ma. How do you figure out the applied force so i can determine the acceleration help.

 

[andrewchang]

the applied force is the friction force.

 

[msimard8]

ok the correct answer is 2.0 m/s. If there is no net force, how do you explain that

 

[andrewchang]

no. Fapplied = 5 x 10^3 N

and there is no friction force. the force applied by the brakes is the only force.