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 = 6.0t2 -1.0t3, where x is in metres and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction?

A) 24 m
B) 12 m
C) 32 m
D) 16 m
E) 2.0 m