What is the distance and speed of a car with constant acceleration?

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Homework Help Overview

The problem involves a car that is initially moving at a speed of 50.0 m/s and comes to a stop over a period of 6.00 seconds due to constant acceleration. The questions posed include determining the distance traveled during braking and the speed of the car after 1.35 seconds of braking.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to calculate acceleration and distance using relevant equations. There is confusion regarding the initial steps and how to apply the equations correctly. Some participants express uncertainty about how to find the speed after a specific time during braking.

Discussion Status

Some guidance has been provided regarding the equations to use for calculating acceleration and distance. Participants are exploring different aspects of the problem, with some having made progress while others continue to seek clarity on specific calculations.

Contextual Notes

There is an emphasis on the assumption of constant acceleration, and participants are navigating through the implications of this assumption in their calculations. The original poster expresses confusion about where to start, indicating a need for foundational understanding.

ScienceGirl90
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Homework Statement


A car is moving at 50.0 m/s and brakes to a halt in 6.00 seconds.
(1)From the time it starts braking, how far does the car travel before the car comes to a halt if its acceleration is constant?
(2)What is the car's speed 1.35 s after it starts to brake if the cars acceleration is constant?


Homework Equations


v=a*t+vo


The Attempt at a Solution


I really just don't where to start with this problem. I'm confused! Please help!
 
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The equation you listed will get you the acceleration, but for the distance you'll need

[tex]v_f^2 = v_0^2 + 2ad[/tex]
 
Ok thank you! I was able to find the distance for question one but I am still stuck as to what is the car's speed 1.35 s after it starts to brake if the cars acceleration is constant?
 
ScienceGirl90 said:
Ok thank you! I was able to find the distance for question one but I am still stuck as to what is the car's speed 1.35 s after it starts to brake if the cars acceleration is constant?

Just use the first formula you gave in your original post. Pay attention to your signs and you'll be golden.
 
Got it. Thanks!
 

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