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1. Acceleration

   Linked via "observer's velocity"

   Relativistic Considerations
   In Special Relativity, the definition of acceleration must account for the changing basis vectors in a reference frame accelerating relative to an inertial frame. While the relationship $\mathbf{F} = m\mathbf{a}$ remains intuitively useful, the perceived acceleration vector depends heavily on the observer's velocity. The proper acceleration ($\alpha$) experienced by an object is the acceleration …