At a certain instant, particles p p and q q have position vectors and velocities given by: → r p = − 7 ^ ı − 2 ^ ȷ m → r q = 7 ^ ı + ^ ȷ m → v p = 7 ^ ı − 7 ^ ȷ m / s → v q = − 4 ^ ı m / s r→p=−7ı^−2ȷ^ mr→q=7ı^+ȷ^ mv→p=7ı^−7ȷ^ m/sv→q=−4ı^ m/s matlab/mathematica input: rp = [-7,-2] rq = [7,1] vp = [7,-7] vq = [-4,0] what is the rate of change ˙ r p q r˙pq of the distance between points p p and q q?