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Homework Help: Conservation of energy problem

  1. Apr 15, 2013 #1
    1. a student throws a ball down with an initial velocity of 5.0 m/s from a point 8.0 m above the base of a track. Find the speed of the ball as it hits the base of the track. The track is designed to losslessly change the direction of the ball up a frictionless ramp. What is the height above the ground reached by the ball

    2. K = 1/2 mv^2
    U = mgh
    E1 = E2

    3. If I knew the mass of the ball this problem would be easy
    U = mgh
    K= 1/2 mv^2
    mgh(initial) + 1/2mv^2(initial) = mgh(final)
    I dont have the mass
    is there an equation that I can sub into the above to isolate the mass or is mass irrelevant as it is on both sides of the equation?

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

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 15, 2013 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Well, of course if the mass is on both sides of the equation, it cancels
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