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2016-04-08T14:46:06+05:30

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Time of one revolution = 40 min
total time = 130 min
so total revolution = 130/40 = 4.25 
now, distance = circumference×total revolution
                      =2π×7 ×4.25 =187 m
displacement is the shortest distance between initial and final position.
So by Pythagoras theorem,
displacement =√[(7)²+(7)²] = 7√2 m ≈ 9.898 m
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