The horsepower, H(s), required for a racecar to overcome wind resistance is given by the function H(s) = 0.00382 +0.078 - 0.027, where s is the speed of the car in miles per hour. What is the average
rate of change in horsepower per unit speed if the racecar increases in speed from 80 mph to 100
mph?
1.64
0.61
12.2
20.0
K

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)