Question

a cyclist completes 8 revolutions of circular track of radius 98m with a uniform speed in 40min. calculate speed

Answer 1

speed =distance / time

to find distance
use 2 pie r

2. 22/7 . 98

=238.85
then 238.85 × 3
=9,076.3
40 m = 40×60 s
2,400s

speed= 9,076.3/ 2400
3.781 m/s answer


........

Answer 2

total distance covered in 8 revolution =
$8 \times 2\pi \: r \\ 16\pi r$


speed = distance / time
16×3.14×98 / 40×60
》2 m/s