Drag racer velocity and acceleration

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Homework Help Overview

The problem involves a drag racer accelerating over a distance with a specified acceleration, followed by deceleration after a parachute opens. The context is kinematics, focusing on velocity and acceleration during different phases of motion.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to identify relevant equations and principles related to kinematics, particularly those involving acceleration and velocity. There is uncertainty about the initial conditions and the time at which the parachute opens.

Discussion Status

The discussion is ongoing, with participants questioning the availability of initial conditions such as time and initial velocity. Some guidance has been offered regarding the need to find the time to reach a specific distance, but no consensus has been reached on a clear approach yet.

Contextual Notes

Key information such as the time at which the parachute opens and the initial velocity of the car is not provided, which is impacting the ability to apply kinematic equations effectively.

deuceszbigz
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Homework Statement



A drag racer, starting from rest, speeds up for 402 m with an acceleration of +23.0 m/s2. A parachute then opens, slowing the car down with an acceleration of -6.70 m/s2. How fast is the racer moving 3.35 102 m after the parachute opens?

Homework Equations



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The Attempt at a Solution



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I have no clue where to begin this problem. Please help!
 
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In order to get help here you have to show some work. It's the rules. You can't possibly know NOTHING about this problem. Give me your thoughts at least. What equations will be involved? What principles are involved?
 
It is clearly a kinematics problem, so I am guessing it has to do with acceleration and velocity. All the variables are given in terms of acceleration and the final answer has to be in terms of velocity, so I assume the starting equation will be: vf = vi + a*t. The only thing is that any of the equations I look at, they are all missing two or more variables.
 
Ok, now do you know the time the parachute opens or is this not given?

If your not given the time, I suggest looking for a different equation.
 
It is not given. It does not give initial velocity either.
 
Ok, then, can you find the time that the car reaches the 402m mark from the information given?

EDIT: Also, if the car starts at rest, what is the initial velocity?
 
Last edited:

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