Firstly I must say if this is in a wrong sub-forum I apologise. This is my first post and I'm new to the website so please bare with me. Also I was unsure of the Prefix so I again apologise if that to, was incorrect. But my Question is that is the acceleration (or deceleration) of an object smooth? By this I mean can the speed of an object increase instantaneously (for example) from 2Mph to 4Mph? Or must it be smooth in it's acceleration by passing all speeds in-between 2Mph and 4Mph to get to the end 4Mph? By passing all speeds in-between i mean such as it goes (in terms of speed) through every number in-between the 2 and 4Mph. Sorry if this is not worded well as I am unsure of how to, but I hope you understand and reply.