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Average Acceleration - Mechanics 101 help

  • 27-09-2012 5:55pm
    #1
    graate
    Registered Users, Registered Users 2 Posts: 15 ✭


    Hey everybody,

    At home stuck on a question hoping some of the more brilliant minds among us could take a gander and help a fellow Padawan out.

    The velocity of a car changes from 5ms^-1 East to 9ms^-1 West in 2.5 seconds. Find the average acceleration of the car.


    My understanding was that you simply use the Equation a = v-u / t

    I.e

    9ms^-1 West- 5ms-^1 East / 2.5 seconds = 1.6ms^-2 West

    a = 1.6ms^-2 West


    _______________________


    The answer in the book is 5.6 ms^-2 West...


    What in the name of Leonardo DiCaprio am I doing wrong here?


Comments

  • #2
    im invisible
    Closed Accounts Posts: 4,372 ✭✭✭im invisible


    think of east in the positive direction and west is negative, or vice versa


  • #3
    graate
    Registered Users, Registered Users 2 Posts: 15 ✭graate


    Thank you my friend. I can't believe I spent an hour on that question.


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