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Yes, indeed from a mechanics point of view, you don't need a Lorentz transformation (LT) if you have a relative rate transformation. A relative rate transformation is a transformation that incorporates a time delay due to relative velocity and is used in special relativity to express coordinate transformations between inertial frames.

Relative rate transformations allow you to express physical relationships between object and observer coordinate systems by accounting for relative velocities and time delays. This makes it possible to accurately describe the time delay and time dilation effects due to relative velocity.

On the other hand, the Lorentz transformation (LT) is one of the coordinate transformations in special relativity, and is derived from the principle of constancy of the speed of light and the principle of relativity. LT has the special property of not only converting relative velocities, but also interconverting between time and space.

Relative rate transitions can provide the information needed to describe physical phenomena within the framework of special relativity. However, the introduction of LT may be useful in some cases to fully capture the basic principles and consistency of special relativity, such as the principle of relativity and the principle of constancy of the speed of light.

In conclusion, from the point of view of mechanics, LT is not particularly necessary if there is a relative rate change, but it is also important to understand the introduction of LT and its characteristics in order to comprehensively understand the whole special relativity theory.

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