Question

an althlete run a mile in less than 4 minutes . he ran the four laps of the race in 58.5, 60.3, 61.4 and 58.9 seconds .

1) what was his total time

2) by how much did he break four- minute barrier .

pls tell the answer

Answer 1

total distance travelled will be equal to the total circumference of the circle traversed.

so,

circumference of the circle = C = 2πR = 2π(2r) = 4πr

so, after two complete rounds, the total distance travelled will be = 2 x 4πr = 8πr

 

as the initial and final position of the particle are same, the net displacement will be zero.

Answer 2

1.) his total time= 58.5+ 60.3+ 61.4+ 58.9=239.1seconds
2.) 0.9 seconds