Answers

2014-06-06T19:57:38+05:30
The circumference=200*22/7
=4400/7
speed of the man=distance/time=4400/(7*40)=110/7m/s
2min 20 sec=140 sec
the total distance travelled= speed *total time=140*110/7=2200m
no. of rounds taken= 2200/(4400/7)=3.5
the total displacement= 2200/7m
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2014-06-07T00:11:25+05:30
Diameter= 200 m Circumference= πd = π200 Time taken to complete one revolution =40s Final time = 2 minutes 20s = 140s Therefore, no.of revolutions in 140s = Total time taken ÷ Time taken to complete one revolution=140÷40=7÷2=3.5 rounds Distance covered = no.of revolutions * circumference =3.5 *π200 = 2200m As the no. of revolution is 3.5 so it clearly shows that the athlete after completing 3 rounds completed another half round. Therefore, displacement = 200m
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