Question

A farmer moves along the boundary of a square field of side 10 m in 40s what will be the magnitude of displacement at end of 2 minutes 20 seconds from his intial position

Answer 1

Given:-
square field of size = 10 m
time taken = 40 sec

total time taken = 2 min 20 sec = 20*2=140 sec
distance covered = ?

in 140 sec the farmer covers 3 and a half round
DRAW A ROUGH SQUARE AN LABLE "O A B C "

OB = √OA² + √AB²
      = √10² + √10²
      = √100 + √100
      = √200
      = 2√100
      = 14.1 M