In reply to my previous question, I have understood that the motion of a bullet fired from a gun is translational motion. However, within translational motion, is it curvilinear or linear and why?  

Dear Student ,
Here the motion of the bullet fired from a gun is linear motion. That is because when a bullet is fired from a gun, it moves in a straight line towards the target. Hence, it is an example of linear motion. 

Regards