Question

Help with physics?

Answer 1

(3)

Explanation:

As shown in the figure above, Point `P` is initially at the given location. After rolling half revolution, its position is at point "new".

The center of the wheel moves through linear distance `=piR`

If we consider a point `Q` which is at a height `R` from point initially in contact with the ground. New position of this point is shown as "new".

From the figure displacement of point `Q =R+piR+R`

`=piR+2R`