Kinetic Energy Vs. Potential Energy confusion.

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Homework Help Overview

The discussion revolves around a physics problem involving the concepts of kinetic energy and potential energy, specifically in the context of a car decelerating to avoid an accident. The problem presents a scenario where a car weighing 5530 N is required to stop before reaching a bridge out sign, with details on its deceleration and gravitational acceleration.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of the Conservation of Energy principle to the problem. Questions are raised about determining the initial speed of the car and what calculations should follow from that.

Discussion Status

Some participants have provided guidance on the relevance of the Conservation of Energy principle and have prompted further exploration of the initial speed of the car. There is an indication of ongoing attempts to clarify the problem and explore different aspects of the physics involved.

Contextual Notes

The original poster expresses uncertainty about the application of the Conservation of Energy in this context, indicating a potential gap in understanding the relationship between kinetic and potential energy in the scenario presented.

teriblekelly
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Homework Statement



A car and driver weighing 5530 N passes a
sign stating \Bridge Out 25:5 m Ahead." She
slams on the brakes, and the car decelerates
at a constant rate of 13:7 m=s2 :
The acceleration of gravity is 9:8 m=s2 :
What is the magnitude of the work done
stopping the car if the car just stops in time
to avoid diving into the water? Answer in
units of J.


Homework Equations


This is where I'm stuck. In class today we learned about Conservation of Energy and I don't know if that applies here.


The Attempt at a Solution

 
Physics news on Phys.org
Yes, Conservation of Energy (COE) applies. Try.
 
Can you find out the speed of the car initially?

From that, what do you think you should calculate?
 
sorry i think i started a new thread by accident can we go to that one? i worked out a few things.
 

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