1. The problem statement, all variables and given/known data I'm reviewing a chapter relating linear and angular kinematics, and I came across this equation.. why does it work and where does it come from? I can't seem to find anything in the textbook explaining it. 2. Relevant equations a = sqrt( (tangential acceleration)2 + (radial acceleration)2 ) 3. The attempt at a solution I know all of the basics quite well, I just don't understand where this formula came from! All help will be very appreciated. Please dont go too in depth and waste your time! A simple answer should definitely suffice! Thank you! .