The Second postulate is much more difficult to accept, because it violates ourcommon sense which is firmly grounded in the Galilean kinematics that we have learned from everyday experiences It implies that it is impossible to accelerate a particle to a speed greater than cThe Second postulate is much more difficult to accept, because it violates our “ common sense”, which is firmly grounded in the Galilean kinematics that we have learned from everyday experiences. It implies that “it is impossible to accelerate a particle to a speed greater than c