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what is the difference between H1 + V12/2 = H2 + V22/2 and I know the...

what is the difference between

H1 + V12/2 = H2 + V22/2

and

I know the difference is gravity, however is the equation H1 + V12/2 = H2 + V22/2 still correct? or do we need to include gravity in the calculation? If we need to include gravity for KE why dont we need to include mass?

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