- #1

Lauren0619

- 11

- 1

## Homework Statement

With brakes fully applied, a 1480 kg car deccelerates from a speed of 91.0 km/hr. What is the work done by the braking force in bringing the car to a stop?[/B]

## Homework Equations

1/2(mass)(v^2)

## The Attempt at a Solution

1/2(1480)(25^2) = 462500

I converted km/hr to m/sec to get 25 for the v value. They want us to include the sign of the acceleration so i added a negative sign to make the answer -462500 but it was wrong (I also tried it without the negative sign). What am I missing? Thank you so much![/B]