The position vector of a moving particle is given by: 7 (t) = 3t? 7 a- Determine the trajectory of the motion, its velocity and its acceleration in the
given frame of reference.

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.