Well Jet pump knocking sound at cut-out

Hello to all!
I’m new at this forum, I recently purchased my 1st home. This is a 1978 home and the water supply is from a well.
Here is the thing (I’ve been reading all over the net for this issue but no answer) my jet pump makes a knocking sound (hammer like) at cut-out....
Well Jet pump knocking sound at cut-out