Grandma henderson challenges michael johnson in the 400-meter dash. grandma h spins her wheelchair wheels 5 times and gives up 15 meters from the starting line. mj makes a complete circle around the track and stops at the starting line. in this race who has the greatest average speed?

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 

Answervery high orbital velocities in a very compact region;