Question

an athlete completes one round of a circular track of diameter 200m in 40s what will be the distance covered and displacement at the end of 2min 20s

Answer 1

diameter =200m

time for one round = 40s

distance travelled in 2 minutes 20 seconds

(2×60+20=140s) = 140/40 = 3.5 rounds

distance travelled = circumference of the circle×3.5

= 2πr×3.5

= 2×22/7×100×3.5 =2200 m

diplacement after 3.5 revolution

= diameter of track

= 200m

Answer 2

Answer:Diameter = 200

Radius = 100

Circumference = 22/7*2*100

=4400/7

Time taken for one round =40 seconds

Total Time = 2 min 20 Dec = 140 sec

So total distance = 3.5*4400/7

=2200m

Now displacement = Diameter of circle i.e 200 m