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Kinematics Question on falling rock

  1. Aug 14, 2016 #1
    1. The problem statement, all variables and given/known data
    A rock is thrown straight upward from the edge of a 30m cliff, rising 10m, then falling all the way down the base of the cliff.

    2. Relevant equations

    3. The attempt at a solution
    Well, because the rock was thrown 10m up, and then it came all the way down, I added those quantities (10m+30m) so I got 40m. But since the displacement is the object's initial position to its final position, regardless of the path actually taken, would I have to count the rock before it was thrown? Then the answer would be 30m
  2. jcsd
  3. Aug 14, 2016 #2


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    You haven't stated what question you are asked.
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