No responses, so let me change the question... A rotating (in x-y plane) rod about one of it's ends. At the other end, from the origin, is a knob with height into the z axis. What is the velocity and acceleration at the top of the knob? Is the velocity and acceleration at the top of the knob different than at the bottom? Is it radius (in x-y plane, distance from origin) times omega = velocity Or is the magnitude of radius need for origin to top of knob? TIA!