If you are traveling at a constant speed with changing direction there is a change in velocity, so you are accelerating.
Depends entirely on your frame of reference! If you are in a car traveling along side it at 50 ms, the car will appear to be standing still. If you are going the opposite direction at 50 ms, it will appear to be traveling at 100ms.
Yes
Velocity or Vector
Direction
South.
You would be going Southeast.
east
north
west
west
west
Traveling from Phoenix, Arizona to Sacramento, California you would be traveling northwest.
South east.
north
North
South or Southwest