A student runs once around a circular school playground of perimeter 400 metres and returns to the starting point. The DISPLACEMENT is:
A400 metres, equal to the total distance run
B200 metres, equal to half the perimeter
CZero metres, because start and end are the same
D100 metres, equal to one quarter of the perimeter
Answer & Solution
Correct answer: C. Zero metres, because start and end are the same
Displacement is the straight-line vector from start to end. Since the student returns to the starting point, displacement is zero. Distance, however, is 400 m.
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