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Initial velocity

  1. Feb 23, 2010 #1
    1. The problem statement, all variables and given/known data
    A dog can jump to a height of 0.20 m. What is the initial velocity of the dog?

    2. Relevant equations

    v=v0+at

    3. The attempt at a solution

    I'm not sure if this is suppose to be a trick question. Are they talking about the gravitational acceleration?

    v=v0+at

    v0= 0
    t=0
    a=(-g)=-9.8m/s2


    v=0+-9.8 * 0
    v=0
     
  2. jcsd
  3. Feb 23, 2010 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Look at it from the point of view of energy - potential and kinetic.

    AM
     
  4. Feb 23, 2010 #3
    No, you have to find Vo. Yes, you use gavitatinal accelertion cus the dog jumps vertically.
    use: vfinal^2 = Vinitial^2 - 2gx, Vfinal = 0 since the dog comes to an abrupt stop at the 0.2m height. Therefore, solve for Vinitial.

    Hope this helps;0
     
  5. Feb 23, 2010 #4
    So,
    vfinal^2 = Vinitial^2 - 2gx
    Vinitial^2= 0 + 2gx
    = 0 + 2*9.8
    = 19.6m/s^2
     
  6. Feb 23, 2010 #5

    NO, Vinitial shud equal = sqrt2gx = sqrt2x9.8x0.2 = 2m/s
     
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