No.
No
yes
No.
As the question is worded - no, they do not.
I would not think so under those conditions.
No
No
yes
yes
It slows to a rest and then starts moving in the opposite direction at constant acceleration in that direction.
No
Yes, a bus can change the direction of its velocity when traveling with constant acceleration. This change in velocity can occur when the bus is accelerating in the opposite direction to its initial velocity. The bus will slow down, stop, and then start moving in the opposite direction.