Question

a girl takes 20 second to complete one round of square field having side 5 metre what will be the total distance and displacement cover at the end of the 2 minute 20 seconds​

Answer 1

20sec =25 m

Therefore

1 sec = 4/5m

Now

New time =2 min 20 sec =140 sec

Then

Distance =4/5×140

=112m

Displacement =0m

Answer 2

we will first find the perimeter of square.

then find the speed .

then we will convert 2min 20sec into 140sec.

finding distance is easy, just multiple 140sec x 1m/1sec because sec will be cancelled, leaving meters.

1 round is equal to 20meters . dividing 140 from 20 gives us total no of round .

there are 7 total rounds so the girl comes back to the initial point.

so distance is 140m and displacement is 0.