Einstein's theory of relativity establishes that the measurement speed light is constant and invariant in any frame reference. In this article, we will review postulate fulfilled by applying Einstein’s velocity addition for case one spatial dimension (1D). This work may be special usefulness physics students teachers pre-university first-year university levels to introduce relativistic theory.

Many secondary school students have encountered difficulties when dealing with absolute value equations and inequalities. This condition might be brought to higher education, including by pre-service mathematics teachers in teacher training colleges. The inequalities, which can observed from solution strategies, indicate the lack of symbol sense. study aims investigate strategies that used whil...