Acceleration of a car followed by abrupt stop

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Homework Help Overview

The problem involves calculating the acceleration of a vehicle that decelerates from 90 km/h to a complete stop over a period of 13 seconds. The subject area pertains to kinematics and the application of acceleration formulas.

Discussion Character

  • Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to apply the acceleration formula but expresses confusion regarding the correctness of their answer. Participants suggest checking the units of measurement and discuss the need for unit consistency before calculations.

Discussion Status

The discussion is focused on clarifying the proper units to use for the calculation. Some participants have provided guidance on converting units to ensure they align correctly for the acceleration formula.

Contextual Notes

The original poster's confusion stems from the differing units of velocity (km/h) and time (s), which need to be coordinated for accurate calculations.

iluvpandas
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Homework Statement


What is the acceleration of a vehicle that changes its velocity from 90 km/h to a dead stop in 13 s?



Homework Equations



i don't understand how to do this correctly

The Attempt at a Solution



i know I am supposed to use the formula for acceleration [a= (Vi-Vf)/T] i plugged in 90 for the Vi and 0( the dead stop) for Vf after that i divided by 13 but the answer i got was wrong.
 
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Double check your units.
 
you mean convert to meters?
 
No. Your velocity is given in km/h and your time is given in s; they need to coordinate before you can just plug them in. You need to either convert your time to hours (in which case acceleration units would be km/h2) or convert your velocity to km/s (acceleration would be in km/s2).
 

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