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CBSE Class 9 Answered

A Car travelling at 22.4m/s skids to stop in 2.55 sec.Determine the skidding distance of the car.(Assume uniform acceleration).
Asked by bcnandi | 23 Sep, 2018, 01:19: PM
answered-by-expert Expert Answer
time to reach zero speed is obtained from " v = u - a×t ", where v is final speed and v = 0 in travel time t seconds with retardation a.
 
hence retardation a = u / t = 22.4/2.55 = 8.784 m/s2
 
distance S = u×t - (1/2)×a×t2 = 22.4×2.55 - (1/2)×8.784×2.55×2.55 = 28.56 m
Answered by Thiyagarajan K | 23 Sep, 2018, 01:59: PM

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CBSE 9 - Physics
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