Answer:
In a primary cell, two electrodes (one of copper and other of zinc) of metal atoms are used. These electrodes are dipped in an electrolyte solution that causes the metals to produce their respective positive and negative ions.
In this way, the flow of charges takes place and supply the electricity to the source.
Unlike a primary cell, a dry cell contains paste of an electrolyte instead of the solution. The contents of electrolyte paste react with each other through a chemical process and convert the chemical energy into electrical energy.
The concept that we need to give solution to this problem is collision equation given by momentum conservation,
Our values are,

Then,
Part A) We can here note that the velocity for the puck is zero (there is not a velocity in that direction)



Part B ) We apply the same solution but know we note that in the collision for the Goalie the velocity is zero.



Answer:
A. Mg+2
Explanation:
im not sure, but since it lost two electrons which have a negative charge it gained two charge.
The magnitude of the electrostatic force between the two charges is 
Explanation:
The magnitude of the electrostatic force between two charges is given by Coulomb's law:

where:
is the Coulomb's constant
are the two charges
r is the separation between the two charges
In this problem, we have:


r = 20.0 cm = 0.20 m
Therefore, the force between the charges is

where the negative sign means that the force is attractive, since the two charges have opposite sign.
Learn more about electrostatic force here:
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Answer:
calcium chloride
Explanation:
an inorganic compound,a salt with the chemical formula CaCl2