I feel like it expresses time, but if there is another answer and they say otherwise, then they are probably right.
Hope this helps!
Answer:
Elements in the periodic table are arranged in order of increasing atomic number
The process of changing from one phase of matter to another is a physical matter.
Answer:
1

2
The distance is
Explanation:
From the question we are told that
The maximum speed of the cheetah is 
The maximum of gazelle is 
The distance ahead is 
Let
denote the time which the cheetah catches the gazelle
Gnerally the equation representing the distance the cheetah needs to move in order to catch the gazelle is

=> 
=> 
=> 
Now at t = 7.5 s

=> 
=> 
=>
Hence the for the gazelle to escape the cheetah it must be 55.2 m