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Homework Help: Projectile Motion Ball Drop

  1. Oct 3, 2009 #1
    1. The problem statement, all variables and given/known data
    A Ball is dropped onto a step at point A and rebounds with a velocity Vo at an angle 15 degrees with the vertical. Determine the value of V0 knowing that just before the ball bounces at Point B its velocity VB forms an angle of 12 degrees with the vertical.


    2. Relevant equations

    X = Vt
    Y = Vt - 0.5gt2

    3. The attempt at a solution

    X = (VoSin15)t
    Y = (VoCos15)t -0.5gt2

    I am not sure how to make use of the other information provided.
  2. jcsd
  3. Oct 3, 2009 #2


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    Homework Helper
    Gold Member

    The most relevant equation:

    Vy(t)^2 = Vy0^2 + 2g (y(t) - y0)

    because we need to use the 0.2m y-displacement.

    Also noteworthy:
    Vx0 = V0 sin(15)
    VxT = VT sin(12)
    Vx0 = VxT
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