2. A runner starting at rest has acceleration a(t) =1+3vt ft/s2 for 9 seconds. a) What is the runner's velocity at 9 seconds? b) How far does the runner travel in those 9 seconds? 3. A particle travels with velocity v(t) =(t-2)sint m/s for Ost s 4seconds. a) What is the particle's displacement? b) What is the total distance traveled