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CBSE Class 9 Answered

numerical
Asked by | 16 Jun, 2008, 04:02: PM
answered-by-expert Expert Answer

use the formula speed= 2πr/40 this will give you speed of athelte

now use the formula d = s x t, and calculate the distance travelled

for calculating the displacement use the logic of no. of revolutions by the athelete in 1220 sec

in 1200 sec the athelete will complete 30 revolutions and hence the displacement in this period will be zero

in the next 20 sec it will complete half more revolution and hence its final displacement will be 200m

Answered by | 16 Jun, 2008, 11:50: PM

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