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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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a
up the incline while ascending and down the incline while descending
b
up the incline while ascending as well as descending
c
down the incline while ascending and up the incline while descending
d
down the incline while ascending as well as descending

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detailed solution

Correct option is B

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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