"Acceleration is finite, I think according to some laws of physics"

This quote by Terry Riley is describing the laws of physics that govern velocity. Velocity is the rate of change of velocity, and it is limited, indicating it has a limit. This is due to the laws of physics, which mention that acceleration is figured out by the force applied to a things and the mass of the object. The greater the force used, the greater the velocity, but the acceleration will still be limited. This quote is stressing the value of the laws of physics in figuring out the velocity of an object. It is likewise a tip that acceleration is limited and can not go beyond the laws of physics.