A solid sphere, a hollow sphere and a disc, all having the same mass and radius, are placed at the top of an incline and released. The friction coefficients between the objects and the incline are the same and not sufficient to allow pure rolling. The least time will be taken in reaching the bottom by

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Kinetic friction will act because point A is slipping.

f=mgcos

We can say that, ma=mg sin=mgcos

So, for all bodies a is the same.

Also, s=ut+12at2=0+12at2=12at2

So, all will take same time if s is same


Hence, the correct option is D: all will take the same time

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