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## Main Question or Discussion Point

Hello.

I am in confusion because I cannot understand which formula will be used in this and that derivation,because there are many formulas of physics.Then how we come to know that this specific formula must be used in this derivation

It is a great confusion for me.

Please solve my problem and define me the basic rules of physics derivations with some simple examples.

thank you.

I am in confusion because I cannot understand which formula will be used in this and that derivation,because there are many formulas of physics.Then how we come to know that this specific formula must be used in this derivation

It is a great confusion for me.

Please solve my problem and define me the basic rules of physics derivations with some simple examples.

thank you.