Magnitude and direction of acceleration

[AshleyAg]

Homework Statement

A car with a mass of 1.3x10^4kg is initially moving at 35 km/hr in a straight line when the car comes to a complete stop at 15m. What is the magnitude and direction of acceleration?b) the magnitude and direction of the breaking force c) thetime required to stop

Homework Equations

The Attempt at a Solution

I got a) 20 m/s b) I didn't understand & c) I didn't understand eathier[/B]

 

[toboldlygo]

Hi! You need to include an attempt at a solution, or we can't help you with the problem. Please edit your post and give us any attempts you've made.

 

[haruspex]

Technically, the question ought to state that acceleration is uniform. Do you know the SUVAT equations?

A) asks for the magnitude and direction of an acceleration. Your proposed answer is a speed. If you meant 20m/s² then I don't think that is right (and you still have not specified a direction). Please post the equations you applied and show your working.

For b), what equation connects acceleration with force? (And it's braking force, not breaking force. Nothing gets broken in the process.)