A rocket leaves the surface of earth at time t=0 and travels straight up from the surface. The height, in feet, of the rocket above the surface of earth is given by y(t), where t is measured in seconds for 0≤t≤600. Values of y(t) for selected values of t are given in the table above. Of the following values of t, at which value would the speed of the rocket most likely be greatest based on the data in the table?.