The Acceleration of the Center of Mass of a System

Multiple Choice

The acceleration of the center of mass of a system of particles changes as a = 4.5t + 2.4t² + 1.1t³, where a is in m/s².If the system starts from rest at t = 0, what is its velocity at t = 2.0 s?

A) 8.0 m/s
B) 14 m/s
C) 20 m/s
D) 27 m/s
E) 34 m/s