Chapter 1.1, Problem 17E

Rising radiosonde The National Weather Service releases approximately 70,000 radiosondes every year to collect data from the atmosphere. Attached to a balloon, a radiosonde rises at about 1000 ft/mm until the balloon bursts in the upper atmosphere Suppose a radiosonde is released from a point 6 ft above the ground and that 5 seconds later, it is 83 ft above the ground Let f(t) represent the height (in feet) that the radiosonde is above the ground t seconds after it is released. Evaluate $\frac{f\left(5\right)-f\left(0\right)}{5-0}$ and interpret the meaning of this quotient.