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Find the initial speed of jump using range and max height

  1. Dec 11, 2013 #1
    1. The problem statement, all variables and given/known data
    A dog jumps a distance, L, and a maximum height, H, where the dog only has horizontal velocity when it travels through the hoop. What is the speed of your dog when he leaves the ground?
    What is the speed of your dog when he goes through the loop? Both answers should NOT be in terms of sinθ or cosθ.
    Max height = H
    Distance = L
    V at max height = Vx

    2. Relevant equations
    V^2 = Vo^2 + 2gΔH
    V = (Vox^2+Voy^2)^.5
    3. The attempt at a solution
    0 = Voy^2 +2gH
    Voy = square root(2gH)

    My problem is I do not know how to find the horizontal component of velocity in order to solve the rest of the problem. I would greatly appreciate any help.

    ps sorry for the bad formatting, this is my first time one the site.
  2. jcsd
  3. Dec 11, 2013 #2


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    Science Advisor
    Homework Helper

    hi cosmo1993! welcome to pf! :smile:

    (try using the X2 button just above the Reply box :wink:)

    let t be the time it reaches the hoop

    write the equations for the x and y directions that involve t

    then eliminate t

    show us what you get :smile:
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