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