Question

drag the missing word into place
but its all relative, the train leaves the station,
it speeds up, thats.
acceleration
position
rest

Explanation:

In physics, when an object speeds up, it is undergoing acceleration. The train leaving the station and speeding up is a classic example of acceleration. Position refers to the location of an object, and rest means an object is not in motion. Since the key action here is speeding up, acceleration is the appropriate term.

Answer:

acceleration