gravity, in the form of centrifugal force
No. The velocity and acceleration are not zero because the direction is changing, thus the velocity and acceleration is changing.
No. An object is accelerating if it is changing speed or direction of travel. Since the person in question is running at a constant speed in a straight line, they are not accelerating.
The answer depends on the degree of complexity you want to put into it. At the simplest, it is linear motion at constant velocity due North. A more complicated version is that it is motion in a circular arc around the globe: heading at a constant speed towards the North pole. It is no longer a velocity because the direction is changing.
just a thought...but is it running correct and the blade is on backwards?
staggered starting positions.
Running tracks are oviod, not circular.
The best thing to say about a runner that is running at a constant velocity is simple. They are really keeping up the good work.
Never!!!
NO! It should not be running.
CLearly no. There is no constant running just short sprinting.
Their acceleration is zero.
Their acceleration is zero.