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Farmer takes 40 s to move along the boundary. Thus, after 3.5 round farmer will at point C of the field. Thus, after 2 min 20 seconds the displacement of farmer will be equal to 14.14 m north east from initial position.
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10m in 40s
so 1m in 4s
in 1s 1/4m
after 2mint 20s i.e. 140s he must cover 35m
using formula of perimeter of square total dist is 40m
so magnitude of displacement is 40-35=5m
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