E.
Answer the following questions,
1.
A farmer moves along the boundary of a rectangular field ABCD as shown is
the figure. He takes 4 minutes to travel across each side.
80 m
A
B
40 m
40 m
D
С
80 m
Is the motion of this farmer uniform or non-uniform? Find his average speed
over one complete round of the field.
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1
Answer :
Type of motion = Non-Uniform, Because he travels in equal duration but not in the same distance
Total Distance = Perimeter of Rectangle
= 2 ( l + b ) = 2 ( 80 + 40 ) = 240 m
Total Time = 4 min * 4
= 240 s * 4 = 960 s
Average Speed = Total Distance / Total Time
= 240 / 960 = 0.25 m/s
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