t 1 2 3 4 Xp(t) -3 5 0 2 Up(t) 1 -1 -2 3 xQ(t) 4 -2 -6 vo (t) 2 -3 1 -2 2. Two particles, P and Q, are moving along the x-axis. At selected times t, the positions, xp and x , and velocities vp and vo , are given in the table above. At what time t are the two particles moving toward each other? (A) t= 1 (B) t= 2 (C) t= 3 (D) t= 4