A cylinder rolls up an inclined plane, reaches some height, and then rolls done (without slipping throughout these motions) the direction of the frictional force acting on the cylinder are:

Options

A. up the incline, while ascending and down the icline, while descending.
B. up the incline, while ascending as well as descending
C. down the incline, while ascending and up the incine,while descending
D. down the incine, while ascending as well as descending.

Answer

B