Bat Speed vs. Rotational Acceleration

See how Bat Speed and Rotational Acceleration are different and how they can be compared side-by-side to understand a hitters swing. Hitters can have similar bat speeds but how quick they build up bat speed is very different. For example, 2 cars can both be going 65 MPH on the freeway, but how fast did they accelerate to that speed? How fast they accelerate is Rotational Acceleration.