The answer is B
I used these equations then i putted it together.
Charge = number of ( electron or proton ) x charge of ( electron or proton )
Force = k x (q1 q2)/r²
Answer:
a. Picture attached
b. V, X
c. 
d. It makes sense cosidering that a normal heart beat rate is between 60 and 100 beats per minute (bpm).
Explanation:
First we have to identify the unknown of this problem:
Considering the characteristics of the problem and that distance and velocity are specified, the acceleration is constant, for that reason we use the equations of uniformly accelerated motion as follows:
If we reorganize the equations, considering that 
and 
are zero because motion starts from rest , we have:
Finally, the analysis of the result leaves us to understand why the normal heart beat rate varies between 60 and 100 bpm.
Answer:
Chemical reaction.
Explanation:
Changes in color and temperature indicates a chemical reaction has taken place.
A chemical reaction involves two species combining to give a product. They are usually a product of chemical changes between two combining species.
In a chemical change;
- New kinds of products are formed
- There are heat changes accompanying such reactions.
- We can have color changes but it is not all indicative.
