A cylinder rolls up an inclined plane, reaches some height, and then rolls down (without slipping throughout these motions). The directions of the 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

When it rolls up it push the ground downward , friction is upward whereas while rolling down applied force is downward, friction is a upward.

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