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Acceleration of skier on slope

  1. May 13, 2007 #1
    This might be an extremely easy question and I'm just over-thinking it, but could someone give me a hand with some grade 10 physics?

    1. A downhill skier has an initial speed of 2.5 m/s. She accelerates up to a speed of 20 m/s in 3.8 s.

    a) Calculate the average acceleration of the skier.


    Okay, so I know that acceleration equals velocity over time, but I'm slightly confused. So I know how to calculate the acceleration of 20 m/s in 3.8 s. Which is ... (about) 5.26. But, I get stuck here.
     
    Last edited: May 13, 2007
  2. jcsd
  3. May 13, 2007 #2

    hage567

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    Why are you confused? Explain.
     
  4. May 13, 2007 #3
    I don't know how to find the average acceleration.
     
    Last edited: May 13, 2007
  5. May 13, 2007 #4
    wait, is that all I have to do?
     
  6. May 13, 2007 #5

    hage567

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    No, your answer isn't correct. Average acceleration is the change in velocity over a given time interval. So what's the velocity at the beginning of your time interval, and what is it at the end?

    Do you recognize this: [tex]a_{ave} = \Delta v / \Delta t[/tex]
     
  7. May 13, 2007 #6
    [tex]a_{ave} = \frac{\Delta v}{\Delta t} = \frac {v_{final} - v_{initial} }{t_{final} - t_{initial} }[/tex]

    it is definition :wink:
     
    Last edited: May 13, 2007
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