A businessman dropped a coin from the top floor of his office building and it fell according to the formula S(t) - -1612 + 21, where is the time in seconds and S(1) is the distance in feet from the top of the building. Step 2 of 3 : What was the average speed of the fall? Use the fact that the coin hit the ground in exactly 1.8 seconds. Round your answer to 2 decimal places. Answer Tables Keypad