An Object Moves Along a Line in Such a Way $s ( t ) = t ^ { 3 } - 6 t ^ { 2 } + 9 t + 3$

Short Answer

An object moves along a line in such a way that its position at time t is $s ( t ) = t ^ { 3 } - 6 t ^ { 2 } + 9 t + 3$ . Find the velocity and acceleration of the object at time t. When is the object stationary?