2. A spy uses a telescope to track a rocket launched vertically from a launch pad 6 km away. The rocket travels upwards at a velocity of 21.6 km per minute. Find the rate of change of the distance between the spy and the rocket when the rocket is 8 km in the air. 17.28 km/mim 3. An observer stands 40 feet away from the Ferry Building’s clock tower. Kells Phelan ‘18 (an apprentice steeplejack) is climbing to the top of the flagpole on top of the Ferry Building to inspect it. He maintains a velocity of 2 ft/sec. (Assume the scenario can be modeled as a right triangle) How fast is the observer to Kells’ distance changing when he is 280 feet above the Embarcadero? 1.98 ft/s