an athlete completes 1 round of a circular track of diameter 200m in 40s.what will be the distance covered and the displacement at the end of 2minutes 20 secs?
2007-02-04 18:50:56 · 3 answers · asked by pooh 3 in Science & Mathematics ➔ Physics
the distance of one round is 2 * pi * 100 = 200 pi
it takes 40 seconds to do 200*pi thus per second this is 200*pi/40 = 5*pi / second
fot 2 minutes and 20 econd = 2*60 + 20 = 140 seconds
id twill thus be the distance 140 * 5 * pi = 700*pi
( 5pi per second thus 140* 5pi in 140 seconds. )
2007-02-04 18:56:13 · answer #1 · answered by gjmb1960 7 · 0⤊ 0⤋
The circumference is the distance travelled which is 2(pi)R
= 2*22/7*200/2=4400/7=629 M
Everytime he finishes a circle, the displacement will become 0 as he comes back to the original position.
In 2min20 secs = 140 seconds, he will be finishing 3 circles in 120 seconds. In rest 20 seconds, he will be away by 314.5 (629/2) meters which is the displacement.
2007-02-04 19:01:05 · answer #2 · answered by jaggie_c 4 · 0⤊ 0⤋
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2016-05-24 14:55:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋