The Velocity of the Center of Mass of a System

Multiple Choice

The velocity of the center of mass of a system of particles changes as v = 4.5 t + 2.4 t² + 1.1 t³, where v is in meters per second.If the system starts from rest at t = 0, what is its position at t = 3.0 s?

A) 7.1 m
B) 21 m
C) 40 m
D) 49 m
E) 64 m