Q.
A body starts from rest and travels a distance S with uniform acceleration, then moves uniformly a distance 2S uniformly, and finally comes to rest after moving further 5S under uniform retardation. The ratio of the average velocity to maximum velocity is
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a
2/5
b
3/5
c
4/7
d
5/7
answer is C.
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Detailed Solution
vavvmax= Total displacement 2 Total displacement during acceleration and retardation + Displacement during uniform velocity vavvmax=8S2(S+5S)+2S=814=47
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