Calculating Acceleration of a Car After Braking

  • Thread starter IDespisePhysics
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  • #1

Homework Statement

A car is traveling at 95 km/hr. The driver steps on the brakes and the car comes to a stop in 60 meters. What is the car's acceleration?

Homework Equations

My issue might be which formula is correct but, I believe I would use, vf^2=vi^2+2ax

The Attempt at a Solution

Every time I begin any problem I write down the givens.
d= 60 meters
Vi= 95 km/hr
Vf= 0 m/s
Are my givens wrong? If not, I've continued to plug it in into the problem above. I assume I'm using Kinematics and since the other equations require 't' or time, I don't believe I use those equations for this problem. As I plug the givens into the equation above, the math doesn't add up to the answer my teacher had said it was; which is -5.81m/s^2.
  • #3
Would I have to convert the 95 km/hr?
That is one of your first steps to convert it out to get similar units.
  • #5

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