When you run around a track at 5 km/h, your velocity is accelerating.

true
false
I think it is true...?

correct. the direction is changing.

Actually, you are accelerating. Position, velocity and acceleration are properties of the body in motion. Velocity changes, meaning there is acceleration, but velocity does not accelerate.

Thank you - it gets confusing

Actually, that statement is false. When you run around a track at a constant speed of 5 km/h, your velocity is not accelerating. Acceleration refers to the rate of change of velocity, so when your velocity remains constant, the acceleration is zero. In this case, since your speed remains constant while running around the track, your velocity is also constant, and therefore not accelerating.