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Introductory Physics Homework Help
How to solve for the distance traveled given force, mass and speed
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[QUOTE="stockzahn, post: 6080699, member: 567491"] That's good. There are some principles forming the basis for these calculations., one of them is energy conservation. In your case there are two forms of energy relevant: The kinetic energy of the car and the work done by the friction force. Since energy must be conserved, the two must be transformed into each other, so the difference of kinetic energy equals the work done by the friction force: $$m_{car}\frac{v_{final}^2-v_{init}^2}{2} = F_{friction}s_{stop}$$ The friction force decelerates the car, that means its mass is negatively accelerated: $$m_{car}\frac{v_{final}^2-v_{init}^2}{2} = m_{car}a_{deceleration}s_{stop}$$ Re-arrainging yields $$v_{final}^2 = v_{init}^2+2a_{deceleration}s_{stop}$$ which is the formula you used. So it can be derived from the energy conservation principle, but what you need to use is its "original" form to solve the task. I hope that helped. [/QUOTE]
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Introductory Physics Homework Help
How to solve for the distance traveled given force, mass and speed
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