Kinetic Energy Vs. Potential Energy confusion.

[teriblekelly]

Homework Statement

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.

Homework 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.

The Attempt at a Solution

 

[saket]

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

 

[Shooting Star]

Can you find out the speed of the car initially?

From that, what do you think you should calculate?

 

[teriblekelly]

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