Magnitude and direction of acceleration

AI Thread Summary
The discussion focuses on calculating the magnitude and direction of acceleration for a car that stops from an initial speed of 35 km/hr over a distance of 15 meters. The initial response incorrectly suggested a speed instead of acceleration, prompting clarification on the need for uniform acceleration and the correct use of SUVAT equations. Participants emphasized the importance of showing work and using appropriate terminology, specifically distinguishing between "braking" and "breaking" force. Additionally, the connection between acceleration and force was highlighted, indicating the need for a relevant equation. Overall, the thread underscores the necessity of clear problem-solving steps in physics homework.
AshleyAg
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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]
 
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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. :smile:
 
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.)
 

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