physics
posted by marquis .
Mike walks 100 meters north, then walks 30 meters south. After this, he walks another 10 meters north. What is the magnitude of his total displacement during this walk, in meters?

physics 
bobpursley
100N30N+10N=80N

physics 
Anonymous
20

physics 
someone
The answer is 80 because 10030+10 is 80.
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