Question

a cyclist is moving at uniform speed of 20 metre per second for 30 seconds he did stop spelling and stops in next 10 seconds
(i) calculate the average retardation
(ii) total distance travelled


Ans is - 2m/s and 700 m respectively




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Answer 1

Answer:

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Explanation:

Uniform speed 20 m/s for 30 s.

Distance S1 travelled is given by, S1 = speed×time = 20×30 = 600 m

retardation a is obtained from "v = u - a×t ", where v is final speed (v=0 here ), u is initial speed and t is time.

retardation a = u / t = 20 / 10 = 2 m/s2 .

Distance S2 covered while retarding :- S2 = u×t - (1/2)×a×t2 = 20×10 - (1/2)×2×10×10 = 100 m

Total distance S1+S2 = 600+100 = 700 m

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