A test tube filled with blood is spinning in a centrifuge. A platelet is pinned to the end of the test tube, a distance of 0.31 m from the axis of rotation for the centrifuge. As the centrifuge speeds up, the angular displacement for the platelet as a function of time is given by:

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction