in this experiment researchers tracked the time it took players wearing light shoes versus heavy shoes to run 20 meters timing gates were set up as shown in the diagram below to operate a computer controlled stopwatch to track the times it took runners to reach each 5 meter marker. this experiment set up led to four times checks during the 20 meter sprint: at 5 meters, 10 meters, 15 meters, and 20 meters. Athletes were asked to run with a maximum level of effort the data shown below are averaged data from 22 athletes.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

80cm/s.

24cm/s.

53.3cm/s.

uio

explanation: