Starting from rest a body slides down a 45º inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The co-efficient of friction between the body and the inclined plane is:
Text Solution
Verified by ExpertsThe correct answer is:
A
Let acceleration in I st case is a 1 and that in second case is a 2
Now vc , 
a 1 t 2 = 
a 2 (2t) 2
⇒ a 2 = 
............(i)
Clearly a 1 = 
= g sin θ ............(ii)
and a 2 = 
= g sin θ – μ g cos θ ............(iii)
From (i), (ii) and (iii),
we get μ = 0.75.
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