Ancient physicists tried to determine the orbits of the planets. every night they carefully tracked the location of the planets and stars they observed. what kind of investigation were these physicists conducting? collective comparative experimental descriptive

correct answer is descriptive

Explanation

Descriptive research is a type of research which describes the characteristics of a phenomena like descriptive research can determine the orbits of planets. In descriptive research we cannot determine how the phenomena or characteristic occur and why it is occurred .

In determination of orbit of planet scientist just observed the star they do not compare it with other star and they do not carry any experiment hence this type of research is descriptive

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation:

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me