Question

A farmer moves along the boundary of a square field of sides 10m in 40s . What will be the displacement of the farmer at the end of 2minutes 20 seconds from his initial point?

Answer 1

total time given 2min 20sec = 120s+20s=140s

after 40sec displacement is 0

after 80sec displacement is 0

after 120sec displacement is 0

remaining time left = 20sec

after next 20sec farmer will be at c

displacement =ac

an triangle abc ac^2=ab^2+bc^2

                                  =(100+100)m^2

                                  =200m^2

                          ac=14.14m