The Position of a Particle Moving Along the X Axis

Multiple Choice

The position of a particle moving along the x axis is given by x = (21 + 22t -6.0t²) m,where t is in s.What is the average velocity during the time interval t = 1.0 s to t = 3.0 s?

A) -6.0 m/s
B) -4.0 m/s
C) -2.0 m/s
D) -8.0 m/s
E) 8.0 m/s