Question

a farmer moves moves along the boundary of a rectangular field ABCD. he takes 4 minutes to travel across each side. is the motion of this farmer uniform or non uniform? find his average speed over one complete round of the field.

Answer 1

total distance 80+40+80+40=240
total time. 4+4+4+4min=16
average speed. 240/ 16
average speed. 15 m/ min

Answer 2

the motion of the farmer is non uniform because he is travelling 40 m in 4 min i.e. he travels with a speed of 1/6 m/s and then travelling 80 m in 4 min i.e., he moves with a speed of 1/3 m/s
He's speed is increasing and decreasing thus, it is not a uniform motin
average speed of the farmer = total distance
------------------------
total time taken
time is in min
firstly convert it into second
16x60
960s
average speed = 40+80+40+80
-----------------------
960
=0.25 m/s

......ok
...is it helpful