Q.

A sphere rolls up the incline as shown in the diagram. The direction of friction acting on it is :

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a

up the incline

b

down the incline

c

no friction acts

d

cannot be determined

answer is B.

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Detailed Solution

Acceleration is due the incline useτ=Iα about centre.
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A sphere rolls up the incline as shown in the diagram. The direction of friction acting on it is :