Question

question select the correct answer. a train is moving in the positive direction down a track. first the train speeds up, and then it slows down. what is its acceleration? the train has positive acceleration throughout. the train has negative acceleration throughout. the train first has positive acceleration and then negative acceleration. the train first has negative acceleration and then positive acceleration.

Explanation:

Acceleration is positive when velocity increases (speeding up) and negative when velocity decreases (slowing down) in the positive direction. The train speeds up first (positive acceleration) then slows down (negative acceleration).

Answer:

The train first has positive acceleration and then negative acceleration.