Acceleration Calculation: 8s to 12s, 64m

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Homework Help Overview

The discussion revolves around a scenario involving a car's motion, specifically focusing on the distance traveled between two time intervals (8 seconds to 12 seconds) and the implications for calculating acceleration. The subject area pertains to kinematics.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the implications of measuring distance over a specific time interval without knowing prior conditions. Questions arise about the possibility of constant velocity versus uniform acceleration, and the need for additional information to determine acceleration accurately.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some have pointed out the insufficiency of information to derive a definitive answer, while others emphasize the need for multiple variables to apply kinematic equations effectively.

Contextual Notes

Participants note the lack of initial conditions and the requirement for at least three variables to solve for acceleration in kinematic equations. There is an acknowledgment of the constraints imposed by the information provided in the original question.

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I have a question just out of curiosity, say that a car is driving along and as it travels, I start to measure the distance from when the car has traveled 8 seconds to 12 seconds, and find out that it is 64 meters. I do not know the distance it traveled before I started to measure(ie. before the 64 meters). What is my acceleration?
 
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It's impossible to say.

You could have been traveling with constant velocity (acceleration=0), and covered 64 metres in those 4 seconds (at 16m/s) or you could have been accelerating with uniform acceleration of 8m/s^2 from 0m/s to 32m/s, or in fact anything in between.

You don't have enough information to answer your question.
 
The time to cover a specific distance will tell you your average speed but you would need another interval, to get a different speed, to find an average acceleration.
 
In any of the basic kinematics equations you need at least three variables to solve for the rest of them. For example, you give only the displacement and the change in time. When I took Gen Physics, what helped me was to list everything the equation gives you, and if you have at least three of them you are good to go.

displacement (x_f - x_i)
start velocity (v_i)
end velocity (v_f)
change in time (t)
acceleration (a)
 

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