CBSE Class 11-science Answered
A motorcyclist moving with a uniform retardation takes 10s and 20s to travel successive quarter kilometre.How much further he will travel before coming to rest?
Asked by dineshchem108 | 23 Aug, 2018, 10:28: PM
Expert Answer
we need to use the formula " S = u×t - (1/2)a×t2 " , where u is initial velocity, a is retardation and t is time duration.
for first quarter kilometer travel in 10 s:- 250 = u×10 - (1/2)×a×100 or u - 5 a = 25 ............(1)
first and second qurter kilometer travel in 30 s: - 500 = u×30 -(1/2)×a×900 or 3u - 45a = 50 ...........(2)
by solving (1) and (2), we get u = 175/6 m/s and a = 5/6 m/s2
total distance S travelled before coming rest :- S = (u×u)/(2×a) = 
since 500 m was already covered, 10.42 m distance will be travelled before coming to rest
Answered by Thiyagarajan K | 24 Aug, 2018, 12:34: PM
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