The position of a particle moving along the x axis is given by x = (21 + 22t − 6t^2)m, where t is in s. What is the average velocity during the time interval t = 1s to t = 3s?

Answer 1

distance/time
at t = 3, x = 21 + 22(3) -6(9)
at t = 1, x = 21 + 22(1) -6(1)
subtract
divide by 2 seconds