Velocity/Acceleration/displacement Help

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Homework Help Overview

The discussion revolves around understanding the concepts of acceleration, displacement, and velocity in the context of a car's braking scenario. The original poster seeks assistance in determining how far a car moves during a braking period when given initial and final velocities along with acceleration.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between acceleration, velocity, and time, questioning the necessity of acceleration in solving the problem. There is an exploration of how to find the time taken to decelerate and the distance traveled during this period.

Discussion Status

Some participants have provided equations and insights into the problem, indicating a productive direction in understanding the relationship between the variables involved. However, there is no explicit consensus on the approach to take for the solution.

Contextual Notes

The problem involves specific values for initial and final velocities, as well as a uniform acceleration, which are critical for the calculations being discussed. Participants are navigating the constraints of the problem without resolving the final outcomes.

austin1250
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Homework Statement



I need help with acceleration/displacment, mainly how far something moves during a acceleratopn period

Homework Equations



Alright, right now i am learning about velocity and acceletarion and i have a question/problem i need help with.

I know the formula for acceleration and stuff, but how do you find out how far the an object. in this case a car moved during the breaking period?

This is the exact question:
A driver of a car traveling at 15 m/s applies the breaks, causing a uniform acceleration of -2.0 m/s^2. how long does it take the car to accelerate to a final speed of 10.0 m/s? How far has the car moved druing the breaking period?



The Attempt at a Solution


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austin1250 said:

Homework Statement



I need help with acceleration/displacment, mainly how far something moves during a acceleratopn period

Homework Equations



Alright, right now i am learning about velocity and acceletarion and i have a question/problem i need help with.

I know the formula for acceleration and stuff, but how do you find out how far the an object. in this case a car moved during the breaking period?

This is the exact question:
A driver of a car traveling at 15 m/s applies the breaks, causing a uniform acceleration of -2.0 m/s^2. how long does it take the car to accelerate to a final speed of 10.0 m/s? How far has the car moved druing the breaking period?

The Attempt at a Solution

-

Here are some equations that might help:
https://www.physicsforums.com/showthread.php?t=110015

You know a and V and want to find t. And then you want to find X.
 
LowlyPion said:
Here are some equations that might help:
https://www.physicsforums.com/showthread.php?t=110015

You know a and V and want to find t. And then you want to find X.

Ah I see. then does accelaration even matter?
Can't you just do Change in velocity Times change in time?
 
austin1250 said:
Ah I see. then does accelaration even matter?
Can't you just do Change in velocity Times change in time?

Of course acceleration matters. When you don't have the time as in this problem you need the acceleration to determine the unknown time. Now for this question they also ask what the distance is and that can be found from a formula for known velocities and acceleration.
 
yeah that's what i meant, i got the first part i needed help with how far/distance it traveld after it accelerated. but yeah i get it now thanks
 

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