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Homework Help: Projectile motion of a rolling ball

  1. Mar 3, 2010 #1
    1. The problem statement, all variables and given/known data
    a ball rolls off the top of a stairway with a horizontal velocity of magnitude 1.50m/s. The steps are 20cm high and 20 cm wide. Which step will the ball hit first?

    2. Relevant equations
    d = v1t + at^2
    a = -9.8m/s^2
    t= 2viSinθ/ 9.8
    horizontal displacement = vi^2Sin2θ/ 9.8

    3. The attempt at a solution
    i actually have no idea what im doing
    Last edited: Mar 3, 2010
  2. jcsd
  3. Mar 3, 2010 #2


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    Homework Helper

    Hi lolimcool, welcome to PF.
    The step has equal height and width.
    So the ball will hit the place where h and x are the same.
    Write down the expression for x and h. Solve for t. Then find step where he ball hits.
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