Kinematics Question on falling rock

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Homework Statement


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.


Homework Equations




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
 

Answers and Replies

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haruspex
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Homework Statement


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.



Homework Equations




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[/B]
You haven't stated what question you are asked.
 

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