# Homework Help: Kinetic Energy Vs. Potential Energy confusion.

1. Oct 25, 2007

### teriblekelly

1. The problem statement, all variables and given/known data

A car and driver weighing 5530 N passes a
sign stating \Bridge Out 25:5 m Ahead." She
slams on the brakes, and the car decelerates
at a constant rate of 13:7 m=s2 :
The acceleration of gravity is 9:8 m=s2 :
What is the magnitude of the work done
stopping the car if the car just stops in time
to avoid diving into the water? Answer in
units of J.

2. Relevant equations
This is where I'm stuck. In class today we learned about Conservation of Energy and I don't know if that applies here.

3. The attempt at a solution

2. Oct 25, 2007

### saket

Yes, Conservation of Energy (COE) applies. Try.

3. Oct 25, 2007

### Shooting Star

Can you find out the speed of the car initially?

From that, what do you think you should calculate?

4. Oct 25, 2007

### teriblekelly

sorry i think i started a new thread by accident can we go to that one? i worked out a few things.