What were the net changes in particle's coordinates?

Question

...if a particle started at A(1,0), circled the origin once counter clockwise and retured to A(1,0)........................?

Answer 1

The net change in C.O. is zero, as net change in C.O. =displacement of the point is a vector & it ends its journey at its starting point.

However, the path traversed ie the gross change in C.O. s being a scalar quantity is equal to 2*(pi)*(radius)= 2*(pi) [since the radius is 1 unit]

Answer 2

If a particle ends where it begins, it's NET change is zero.

The GROSS change would be 2pi*radius (circumference) if it moves in a concentric circle.

Answer 3

The net change is Zero, ends where it begins.

The displacement, as the answerer above stated, is the circumference, about 6.28 units.