The Vector R(t) Is the Position Vector of a Particle $$r ( t ) = \left( 3 t ^ { 2 } + 3 \right) i + \left( 4 t ^ { 3 } - 2 t \right) k$$

Multiple Choice

The vector r(t) is the position vector of a particle at time t. Find the angle between the velocity and the acceleration vectors at time t = 0.
- $$r ( t ) = \left( 3 t ^ { 2 } + 3 \right) i + \left( 4 t ^ { 3 } - 2 t \right) k$$

A) 0
B) $\pi$
C) $\frac { \pi } { 4 }$
D) $\frac { \pi } { 2 }$