How much time does it take a cheetah to travel 300 meters at a speed of 15 meters per second

20 s

Explanation: speed is expressed as distance over time. so we will derive the equation to find t.

v = d /t so derive first then t=d/v

t= 300m / 15 m/s cancel m and the remaining unit is s which is the unit for time

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.