5.) During the construction of a high-rise building, a worker accidentally dropped his portable electric screwdriver from a height of 400 ft. After t seconds, the screwdriver had fallen a distance of s(t) = -16t? + 400 A. How long did it take the screwdriver to hit the ground? B. What was the average velocity of the screwdriver between the times it was dropped and the time it hit the ground? C. What was the velocity of the screwdriver at the time it hit the ground? 6. The initial population in a bacteria colony is 10,000. After t hours, the colony has grown by

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