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Homework Help: Is my speed calculation correct?

  1. Jan 18, 2010 #1
    1. The problem statement, all variables and given/known data
    Kayleigh is standing on top of a 30 m high cliff shoots a 500 g arrow with a speed of 25 m/s. What is the impact speed of the arrow right before it strikes the ground below? Ignore air resistance and friction.


    2. Relevant equations
    Et= Ek+Eg


    3. The attempt at a solution

    1/2mv1^2 + mgh = 1/2mv2^2

    v2^2= Square root of 2(1/2 (25m/s)^2 + (9.8 m/s^2)(30m)
    vs^2= 34.82 m/s


    Is my answer correct?
     
  2. jcsd
  3. Jan 18, 2010 #2

    rock.freak667

    User Avatar
    Homework Helper

    Yes it looks correct to me.
     
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