Starting from rest a body slides down a \( 45^{\circ} \) inclined plane in twice the time it tak...

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Starting from rest a body slides down a \( 45^{\circ} \) 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:
(a) 0.75
(b) 0.33
(c) 0.25
(d) 0.80
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