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An athelete moves along a path PQRSTUVP,...

An athelete moves along a path PQRSTUVP, in 44 seconds as shown in the figure, then the average speed of the athlete is ______ `m s^(-1)`

A

zero

B

` 5/7`

C

`5/11`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Total distance traced by the athlete= sum of perimeter of two circles
` = 2 pi r_(1) + 2pir_(2) = 2pi (r_(1) + r_(2)`
` = 2pi (2+3) = 10 pi `
time taken to trace the path , (t) = 44s
Average speed = `(" total distance")/(" total time taken")`
` (10pi)/44`
` = (10xx 22)/(7 xx 44) = 5//7 ms ^(-1)`
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