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A cylinder rolls up an inclined plane, reaches some height and then rolls down (without slipping through out these motions). The directions of frictional force acting on the cylinder are

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up the incline while ascending and down the incline while descending

up the incline while ascending as well as descending

down the incline while ascending and up the incline while descending

down the incline while ascending as well as descending

answer is B.

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Detailed Solution

While ascending velocity decreases and friction acts upwards to reduce angular velocity. Similarly, while descending velocity increases and so the friction acts upwards to increase angular velocity.

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