Question

an athlete running with uniform speed along circular track of radius 42m complete 1 round in 40 seconds calculate average speed and average velocity and time interval of 0 to20 seconds

Answer 1

1 round complete in 40 sec

so in 20 sec he will cover half round


$distance \: covered \: = \pi \: r$

= 22/7 × 42

= 132m

Average speed = total distance / total time

= 132/20

= 6.6m/s

Average velocity = Total displacement/total time

= 2r/20

= 2×42/ 20

= 84/20

= 4.2 m/s


Thanks