A runner, jogging along a straight line path, starts at a position 110 m east of

Question

A runner, jogging along a straight line path, starts at a position 110 m east of a milestone marker and heads west. After a short time interval he is 45 m west of the mile marker. Consider east to be the positive x-direction.
(a) What is the runner's displacement from his starting point? (m in the x-direction)
(b) What is his displacement from the milestone? (m in the x-direction)
(c) The runner then turns around and heads east. If at a later time the runner is 130 east of the milestone, what is his displacement from the starting point at this time? (m in the x-direction)
(d) What is the total distance traveled from the starting point if the runner stops at the final position listed in part (c)?

Explanation / Answer

a) 110 + 45 = 155m

b) 110 - 45 = 65m

c) 130 - 110 = 20m

d) 110 + 45 + 45 + 130 = 330m

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