so, let me try and get this:

you gun it in first
you change gear
you gun it in second
you dip the clutch

are you still accelerating when you change from first to second between the changes and when the clutch is disengaged for that fraction of a second?
ie, is your speed still increasing because the momentum of the vehicle is causing the car to accelerate, even for a split second, after you have stopped sending power throgh the transmission?

theory and practical seem to show 2 different things

the theory is that with no power you wouldn't accelerate any more, although you may be able to coast at that sort of speed for some distance before the speed starts to drop off
but the practical seems to be that the speedo tends to keep going after you've lifted, so does this mean the speedo needle is continuing to move after you've stopped accelerating?

i'm still confused

i can understand it the other way, as soon as you take your foot of the brake pedal, you don't slow down as quickly, but is it the opposite the other way around like it should be?