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## Homework Statement

A car with a mass of 1800 kg slows from 42 km/h [E] to 28 km/h [E]. The impulse from the brakes is?

I know its a simple question but I was hoping if I could get a walkthrough. I keep getting the answer 2.5 x 10^4 N*s [W] and the answer is 7.0 x 10^3 N*s

## Homework Equations

p=pf-pi

## The Attempt at a Solution

(1800)(28[E])-(1800)(42[E])=50400[E]-75600[E]

=25200[W]

=2.5 x 10^4 N*s [W]