Find the average velocity over the time interval 03 if the

Question

1. Find the average velocity over the time interval [0,3] if the displacement is given by s(t)=t³-1.4t²+1.7t+5. Round your answer to two decimal places.

2. A particle moves in a straight line in such a way that the position in time is given by s(t)=t³-5.5t²+2.8t+1. Starting from time=0, when is the first time that the particle starts moving in the negative direction?