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?