What is the Velocity of a Car with Constant Acceleration?

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Homework Help Overview

The discussion revolves around a physics problem involving a car traveling with constant acceleration. The scenario includes two checkpoints, A and B, separated by a distance of 81.4 meters, and the time taken to travel this distance is 5.89 seconds. Participants are tasked with finding the velocity at checkpoint B given an acceleration of 7.45 m/s².

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to clarify the definition of velocity VB and its relation to the checkpoints. There is a suggestion to first determine the velocity at checkpoint A. Some participants express uncertainty about how to calculate the velocities with the provided data.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the use of kinematic equations to relate distance, time, acceleration, and initial velocity, but no consensus has been reached on a specific approach.

Contextual Notes

Participants are working with the constraints of the problem, including the known distance, time, and acceleration, while expressing confusion about the initial velocity and how to apply the equations of motion effectively.

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Homework Statement


Part 1 Consider a car which is traveling along a straight road with constant acceleration a. There are two checkpoints, A and B , which are a distance 81.4 m apart. The time it takes for the car to travel from A to B is 5.89 s.

Part 2 Find the velocity VB for the case where the acceleration is 7.45 m/s^2.

The Attempt at a Solution


acceleration multiplied by the final time does not give me the answer
 
Last edited:
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What is VB? Is that supposed to be the velocity once it reaches checkpoint B?
 
yea my browser won't load the functions so it should read V(sub)B which is the velocity once it reaches checkpoint B.
 
Perhaps start by finding what the velocity at checkpoint A is.
 
how would you go by doing that?
 
anyone? I have no clue how to find the velocity at either checkpoints with the given data
 
Take A to be the initial point, time = 0.
Then for the trip to B you know d, t, and a. Don't know Vi.
You could make progress with d = Vi*t + 0.5a*t^2 which has only one unknown.
There is another formula like that with a Vf instead of a Vi which would get you to the answer in one step.
 

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