Kinenatics (NOT cst acceleration)

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Homework Help Overview

The problem involves kinematics, specifically addressing a scenario with variable acceleration rather than constant acceleration. The context includes a vehicle approaching an obstacle with a defined speed, reaction time, and maximum deceleration.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • The original poster attempts to understand how to set up an equation for a problem involving non-constant acceleration. Some participants question whether the acceleration can be considered constant during the braking phase, while others suggest that maximum deceleration should be applied immediately upon braking.

Discussion Status

The discussion includes varying interpretations of the problem setup, with some participants exploring the implications of constant versus variable acceleration. There is no explicit consensus, but the conversation reflects an engagement with the problem's complexities.

Contextual Notes

Participants are navigating assumptions about the nature of acceleration in the context of the problem, particularly regarding the initial reaction time and its impact on braking distance.

emilinus
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[SOLVED] kinenatics (NOT cst acceleration)

I have no idea how to solve a problem that doesn't have constant acceleration. I'm guessing you have to set up an equation using the given values and solve for the variable..but I don't know.

This is the question anyhow:

You're driving down the highway late one night at 15.5 m/s when a deer steps onto the road 51.2 m in front of you. Your reaction time before stepping on the brakes is 0.810 s, and the maximum deceleration of your car is 8.11 m/s^2. How much distance is between you and the deer when you come to a stop?
 
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I would assume the acceleration is constant in this problem. I think that if you slam the breaks from the beginning, you should be applying the maximum acceleration for that interval. What else could "slamming" the breaks mean besides hitting them as hard as you can?
 
ya got it nevermind
 
Cool!:smile:
 

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