Answer the following question given this paragraph: 

Discussion The minus sign indicates that acceleration is to the left. This sign is reasonable because the train initially has a positive velocity in this problem, and a negative acceleration would oppose the motion. Again, acceleration is in the same direction as the change in velocity, which is negative here. This acceleration can be called a deceleration because it has a direction opposite to the velocity.


Q: Deceleration is the opposite of what?

 Choices:

- stopping

- stimulation

- vibration

- acceleration

A:
acceleration
