Insert line chart for specific column in each sheet AND calculate velocity of each line

Hi every one
I want to have line diagram as what you can see in sheet 434150 for column O .
but first i have to calculate or make column M and N and O.I used formula for them
and after that i have to find velocity or speed of line for each diagram of every sheets(because i have many sheets)
so please help me with macro code
thank you so much