Question

an athlete completes round of circular track of diameter 200m in 20 seconds calculate the distance travelled by the athlete ...second displacement of the athlete at the end of 1 in 10 second​

Answer 1

Diameter =200m
Time=20sec 
No. Of rounds in1 minute 10sec are
=70/20=3.5 rounds 
Distance in 3.5 rounds is 3.5*2*3.14*200
=4400m
Displacement =2*r
=2*200
=400m