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Homework Help: Motion question (simple)

  1. Feb 22, 2010 #1
    1. The problem statement, all variables and given/known data
    A child throws a snowball with a horizontal velocity of 18m/s directly toward a tree, from a distance of 9.0m and a height above the ground of 1.5m

    a) after what time interval does the snowball hit the tree?
    b) at what height above the ground will the snowball hit the tree?
    c) determine the snowball's velocity as it strikes the tree.

    2. Relevant equations


    3. The attempt at a solution

    For a I got 0.5s from t = d/v

    For b and c I have no idea. I am missing the viy value. I have no idea how to any other information.
  2. jcsd
  3. Feb 22, 2010 #2


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    yes OK; ultimately you'll have to be sure that the snowball doesn't hit the ground before it reaches the tree.
    The problem statement notes that the snowball is thrown with a horizontal velocity. What does that tell you about the snowball's initial speed in the vertical y direction?
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