Well basically in physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant, it is said to be conserved over time. This law means that energy can neither be created nor destroyed, it can only be transformed or transferred from one form to another.
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Answer:
For Total energy and momentum to be conserved, the minimum energy of the photons released is equal to twice the rest mass energy of an electron that is 
The annihilation of electron -positron cannot produce a single photon. It is prohibited by the law of conservation of energy and momentum.
Answer:
lunar highlands
Explanation:
Seeing the moon from the earth we can see that some parts are more illuminated than others, these different regions of the moon have been assigned a name , and have different properties.
The brightest parts are called lunar highlands, because they are at a higher elevation than the darkest parts, called lunar marias.
The lunar highlands are seen from the earth a <u>whiter color than the rest of the moon</u> due to its altitude.
A=f/m
A=900/425
A=2.18
To determine acceleration you divide the force by the mass.
