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)`

Options

A. zero
B. `5/7`
C. `5/11`
D. None of these

Answer

B

Explanation

Total distance traced by the athlete = sum of perimeter of two circles
= `2pir_(1)+2pir_(2)=2pi(r_(1)+r_(2))`
= `2pi(2+3)=10pi`
Time taken to trace the path, (t) = 44s
Average speed = `("total distance")/("total time taken")`
= `(10pi)/44`
= `(10xx22)/(7xx44)=5/7ms^(-1)`