Hi!
I would like to know how you can find the center of rotation when you are 2 objects on a graph? I learnt something about perpendicular bisectors but I am not quite sure how you apply that to this question!!
Thanks:p

Two methods:

1. For each object. Draw a line perpendicular to the velocity vector. The center of the circle is where those two lines intersect.

2. Alternative method - if you can define two distinct points for each object at two different points in time (call them points A1 and A2 for object A, and points B1 and B2 for object 2), then draw a line from A1 to A2 and from B1 to B2. These are two chords of the circle. Draw the perpendicular bisector of two chords, and where these lines intersect is the center of the circle.