Answers

2016-04-13T00:50:00+05:30
Distance covered in 30s = 200m
diameter = 200m r= 100m
circumference =2π×100=200π
∴distance covered in 30s = circumference of track=200π=628m
displacement will zer(0) as the final and initial point of athlete is zero , displacement is the shortest distance between initial and final point
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2016-04-13T10:10:54+05:30
Given,
diameter of a circular track = 200 m
radius = 100 m
circumference of the circle = distance covered by the athlete = 2πr
                                              = 2 × 22/7 × 100
                                              = 628.4 m
displacement after 30 sec = 0
since, final position and initial position are same.

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