Minimum deaceleration untll the car stops

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Homework Help Overview

The problem involves a car that needs to stop within a specified distance, requiring calculations related to acceleration and time. The subject area includes kinematics and motion equations.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the conversion of speed from miles per hour to meters per second as a necessary first step. There is also a mention of using the equation for acceleration based on distance and initial speed.

Discussion Status

Some participants have provided guidance on unit conversion, and there is acknowledgment of a potential error in the original poster's calculations. Multiple interpretations of the problem setup are being explored.

Contextual Notes

The original poster's calculations appear to be based on incorrect unit conversions, which may have affected their results. The problem constraints include the distance the car must stop within and the initial speed provided in non-metric units.

forensicchemgirl
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what am i doing wrong??
every time i try to answer this i get t=.2s and a=-1651ms^-2

the problem reads...
A car traveling at 25mi/h is to stop on a 35m-long shoulder of the road. (a) What is the required magnitude of he minimum acceleration? (b)How much time will elapse during this minimum deaceleration untll the car stops.

i used the equation...
a=v^2/2x



 
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i think the first time is to convert 25mi/h into meters per second.

~Amy
 
Yes, use 1 mile =1.6km, and don't forget to convert to m/s, so you need to change out of km/h. 1h=3600s. That equation is right.
 
yes i did convert to m/s wrong thanks for the help.:smile: :-p
 

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