A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude

NCERT Intext Question
class 9 chapter Motion
A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?

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Thanku sir ji 🙏