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The lengths of smooth & rough inclined planes of inclination 45° is same. Times of sliding of a body on two surfaces is t1 ,t2 and m = 0.75, then t1 : t2 =

a
2 : 1
b
2 : 3
c
1 : 2
d
3 : 2

detailed solution

Correct option is C

tsmooth=2lgsin⁡θ;trough =2lgsin⁡θ−μkcos⁡θ

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