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[" (c) "1400m],[" An athlete completes o...

[" (c) "1400m],[" An athlete completes one round of a circular track of radius "],[R" in "40" sec.What will be his displacement at the end of "],[2min.20sec," [NCERT "1990" ; Kerala PMT "2004" ] "],[[" (a) Zero "," (b) "2R],[" (c) "2 pi R," (d) "7 pi R]]

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