Which graph/s show/s zero velocity? * V d I and II t ||| III and IV O I, II, and IV O None of these V V d t ||| Which graph/s show/s constant acceleration? * I and II O III and IV O I, II, and IV None of these t || v V t V IV d t || t IV Which graph/s show/s constant velocity? * EK d I t I and II III and IV O I, II, and IV t None of these t || O -51 m/s O-1.23x10^2 m/s O 51 m/s O 1.23x10^-2 m/s t IV An object's velocity, v, in meters per second is described by the following function of time, t, in seconds for a substantial length of time. What is its instantaneous velocity at 3s? v(t) = 6t (2 t) + 3 -