15 . See Figure below . There are 3 persons , A, B, and O. Person A moves with constant velocity from A, at to =0 s to A, at t, = 10 s, meanwhile Person B moves with constant velocity from Bo to B, during the same time interval . Person O does not move . (Unit is required too . Total 4 points .) (a) From point view of Person O (that is, O is the observer ), x and y components of person A's position at t1 = and (b) From point view of Person B, during this time interval , (b1 ) x and y components of person O's displacement and (b2 ) x and y components of person A's velocity and (c) From point view of Person A, x and y components of person B's velocity = and y [meter] Bo B1 Ao x [meter] -10 -9 10 0