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## Main Question or Discussion Point

hello,

i am trying to learn the derivation of the momentum operator and i found 2 ways of deriving it. one is using fourier transform and the other is taking the time derivative of the expectation value of x.

i just want to know what is the physical interpretation of the time rate of change of <x>

thank you

i am trying to learn the derivation of the momentum operator and i found 2 ways of deriving it. one is using fourier transform and the other is taking the time derivative of the expectation value of x.

i just want to know what is the physical interpretation of the time rate of change of <x>

thank you