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Question

John travels 250 m to North but then back-tracks to South for 100 m to pick up a friend. What is John’s total displacement?

A
100 m
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B
150 m
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C
50 m
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D
250 m
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Solution

The correct option is B 150 m
Let us say the initial position of john xi=0
And, his final position is the distance travelled in North minus distance travelled in South i.e. xf=250100=150 m
Hence, the displacement of John is given as
D=xfxi=1500=150 m

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