A runner,jogging alone a staight line path,starts at a position 60m east of a milestone marker and heads west.After a short time interval he is 20m west of the mile marker.Choose east to be the positive x direction.What is the runner's displacement f

A runner,jogging alone a staight line path,starts at a position 60m east of a milestone marker and heads west.After a short time interval he is 20m west of the mile marker.Choose east to be the positive x direction.What is the runner's displacement f
A runner,jogging alone a staight line path,starts at a position 60m east of a milestone marker and heads west.After a short time interval he is 20m west of the mile marker.Choose east to be the positive x direction.
What is the runner's displacement from his starting point?
What is his displacement from the milestone?
The runner then around and heads east.If at a later time the runner is140m east of the milestone,what is his displacement from the starting point at this time?
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what is the total distance traveled from the starting point if the runner stops at the final position listed in part (c)?

A runner,jogging alone a staight line path,starts at a position 60m east of a milestone marker and heads west.After a short time interval he is 20m west of the mile marker.Choose east to be the positive x direction.What is the runner's displacement f
视乎是数学题
What is the runner's displacement from his starting point?
-80
What is his displacement from the milestone?
-20
what is his displacement from the starting point at this time?
+60