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Unity rigidbody drag and top speed relation

// If you want a rigidbody with non-zero drag to achieve a particular top speed (velocity.magnitude, always positive), use one of this equations:
rb.drag = sumOfAppliedAccelerations.magnitude / (topSpeed + sumOfAppliedAccelerations.magnitude * Time.fixedDeltaTime);
rb.drag = sumOfAppliedForces.magnitude / (rb.mass * topSpeed + sumOfAppliedForces.magnitude * Time.fixedDeltaTime);
// Conversely, top speed of a rigidbody with non-zero drag can be calculated from this equations:
topSpeed = sumOfAppliedAccelerations.magnitude * (1f / rb.drag - Time.fixedDeltaTime);
topSpeed = sumOfAppliedForces.magnitude / rb.mass * (1f / rb.drag - Time.fixedDeltaTime);

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