In the text we calculated the instantaneous speed at t = 4 of an object falling according to the formula s = 16t² by first calculating average speed over intervals of time following t = 4; that is, we calculated average speeds over the intervals 4 to 5, 4 to 4.1, 4 to 4.01, and so on. Calculate the instantaneous speed at t = 4 by working with average speeds over the time intervals 3 to 4, 3.9 to 4, 3.99 to 4, and so on.