Two skiers are moving in a circular path in the same direction. One of them is the champion of the city. The other one has started training only recently. The

champion completes each lap 2 minutes faster than the beginner. He overtakes the

beginner every 24 minutes. How many minutes does it take for the champion to

complete a circle?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)