Script to measure the speed of any picked object in your animation, in various real-world units. Meters per second, Kilometers per hour, Miles per hour, Inches per second, etc.
The speed can be set as the 'immediate speed' at the current frame time, or an average over a freely selectable number of frames, for a smoother readout.

Cleanly written, easily adaptable and very useful in General, with a handy GUI in a floating window.