Question

An athlete complete 2 rounds of a circular path of diameter 400 m in 40 sec what will be the distance covered and displacement at the end of 2 min

Answer 1

solution.

circumference of circle= pi r^2

= pi (200)^2
= 40000 pi

= 125600 m

now, speed= 125600/ 40

= 3100m/s

Distance covered in 2 min or 120 sec=

= 3100*120= 376800 m or 376.8 km

The displacement will be zero..

Because he take 3 round in 120sec & comes back to same place

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hope my ANSWER IS SATISFACT YOU.☺☺

Answer 2

given that :
2 rounds = 400×2 =800
time taken =40sec
distance covered after 2 min =?
800 mtrs 40 sec time taken to complete

*2min =60×2=120 sec
800÷40=20 mtrs
20×120=2400mtrs ans