an athlete completes one round of circular track of diameter 200m in 40 seconds calculate the total distance covered by athletes in 1 round
Answers
Answer:
Time taken by athlete to complete one round = 40 seconds. Distance covered = ?? Displacement = ?? Hence, the distance covered at the end of 2 min 20 seconds is 2200 m.
Explanation:
Given : Diameter of the circular track D=2R=200 m
Time t=2 minutes 20 s =140 s
As the athlete completes one round in 40 seconds, thus he will be at point B after 140 seconds by covering three and half rounds.
∴ Displacement of the athlete s
′
=2R=200 m
Distance covered d=3.5×(2πR)
d=3.5×
7
22
×200=2200 m
...
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Answer:
Hope this will help you!!
Given parameters
The diameter of the circular track = 200 m
Radius (r) = 200/2
r = 100 m
Time is taken by an athlete to complete one round = 40 seconds.
Displacement = ??
Speed = Distance/Time
Total time athlete moves – 2 min 20 seconds
2 min 20 seconds = 2 × 60 + 20
2 min 20 seconds = 140 seconds
Need to find the distance covered in one round
Distance covered in one round = Circumference of circle
Distance covered in one round = 2πr
Distance covered in one round = 2
Distance covered in one round = 2 × 100π
Distance covered in one round =200π
Time is taken by an athlete to complete one round = 40 seconds.
Number of rounds completed in 140s = 140/40
Number of rounds completed in 140s = 35
Distance covered = 3.5 × circumference
Distance covered = 3.5 × 2πr
Distance covered = 3.5 × 2 × 3.14 × 100
Distance covered = 2200 m
Hence, the distance covered at the end of 2 min 20 seconds is 2200 m or 22 km.
And displacement is 200 m as it returns to the initial position.