Question

drag the missing word into place but it’s all relative; the train leaves the station; it speeds up, that’s blank. options: acceleration, position, fast.

Explanation:

In physics (a subfield of Natural Science), acceleration is defined as the rate of change of velocity. When a train speeds up, its velocity is changing, which is acceleration. "Position" refers to where an object is, and "fast" describes speed (magnitude of velocity), but speeding up is a change in velocity, so acceleration is the correct term.

Answer:

acceleration