A given object takes n times more time to slide down 45 degree rough inclined plane as it takes to - Physics - Laws Of Motion

Question

A given object takes n times more time to slide down 45 degree
rough inclined plane as it takes to slide down a perfectly smooth
45 degree incline The coefficient of kinetic friction between the
object and the incline is ??

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A given object takes n times more time to slide down 45 degree rough inclined plane as it takes to slide down a perfectly smooth 45 degree incline.The coefficient of kinetic friction between the object and the incline is ??