Question

a person moves in a circullar path of radius 4m for one revolutionit takes 20 sec . find the distance, displacement after 1 min 25 sec​

Answer 1

Answer:

t= 1 min 25 sec = (60+25) sec = 85 sec

after each complete rotation, displacement becomes zero

no. of displacement= (85/20)= 4+(1/4)

so, displacement in (1/4) rotation= 4*4 = 16m

(displacement for 3 rotation =0 m)

Distance in 4+(1/4) rotation= 4*2πr+πr = 9πr