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Calc. the car's average acceleration

  1. Sep 5, 2007 #1
    Help please :)

    1. The problem statement, all variables and given/known data

    A Car with a velocity of 25m/s[E] changes its velocity to 25m/s in 15s. Calc. the car's average acceleration.

    2. Relevant equations

    Aav= Vf - Vi / T

    3. The attempt at a solution

    I know that the angle is = to 45 degrees S of W since it's a right angle triangle and two sides are equal, therefore, 90 + 45 + 45 = 180.
  2. jcsd
  3. Sep 5, 2007 #2


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    Homework Helper

    You are dealing with vectors here? Do you know how to express the formula you gave with vectors?
  4. Sep 5, 2007 #3
    Yes dealing with vectors. Express the formula with vectors? I don't think so...? I've been learning all this Dx and Dy stuff in class. X-components, y-compenents, sin/cos/tan stuff.
  5. Sep 5, 2007 #4
    Well X and Y components are the axis, or directions North is +Y, South is -Y, East is +X, West -X.

    Just start by making a quick outline of the problem, on a set of axis, that always helps.
  6. Sep 5, 2007 #5


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    Homework Helper

    Are you familiar with this type of notation: [tex]\vec{r} = 34\vec{i} + 25\vec{j}[/tex] (just an arbitrary vector... nothing to do with the problem... i denotes a unit vector in the x-direction... j denotes a unit vector in the y direction)
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