Question

an athlete complete one round of a circular track of diameter 200m in 40sec .what will be the distance covered and the displacement at the end of 2min 20 sec?

Answer 1

length AB=200m=2R

time taken to complete one round=40 sec

let the starting point be A

in 140 sec or 2 min 20 sec number of rounds completed=

distance traveled=3.5 * (2**R)=3.5*2**100 m=2200 m (approx)

displacement refers to change in position from the starting point.the final point is B

as after 3.5 revolutions(starting from A) the athlete will be at B.

displacement=200m

Answer 2

Hey here is ROCKING ROHIT
we have to do this step by step like this

length AB=200m=2R

time taken to complete one round=40 sec

let the starting point be A

in 140 sec or 2 min 20 sec number of rounds completed=14040=3.514040=3.5

distance traveled=3.5 * (2*ππ*R)=3.5*2*ππ*100 m=2200 m (approx)

displacement refers to change in position from the starting point.the final point is B

as after 3.5 revolutions(starting from A) the athlete will be at B.

displacement=200m
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