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In physics the study of rigid body motion allows for several ways to define the acceleration of a body. The usual definition of acceleration entails following a single particle/point of a rigid body and observing its changes in velocity. In this article the notion of spatial acceleration is explored, which entails looking at a fixed point in space and observing the change in velocity of the particles that pass through that point. This is similar to the definition of acceleration in fluid dynamics where typically one measures velocity and/or acceleration at a fixed point inside a testing apparatus.
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