a cyclist is moving around a circular path of radius 21m, in 5 min he covers three rounds calculate the total distance covered by him , total displacement and the speed during his journey.
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(a) Total distance covered
s = 2πr × t
s = 2πr × 3
= 2 × 22 / 7 × 63 × 3
= 1188 m
(b) Displacement = zero
(c) Speed = Distance covered / time taken
= 1188 / 180 = 6.6 m / s
( ∵ 3 min = 3 × 60 = 180 sec )
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