Question

which of the following runners are accelerating? select all that apply.
a sprinter who is speeding up at the beginning of a 100 - meter race
a cross - country athlete who is standing still while waiting to drink from a water fountain after a run
a distance runner who is running at a steady pace on the straight part of a track

Explanation:

Acceleration occurs when an object changes its speed (speeds up or slows down) or changes its direction.

1. A sprinter speeding up has a change in speed, so they are accelerating.
2. An athlete standing still has no change in speed (speed = 0, constant), so they are not accelerating.
3. A runner at a steady pace on a straight track has constant speed and direction, so they are not accelerating.

Answer:

a. a sprinter who is speeding up at the beginning of a 100-meter race