I think postulates of Relativity is related to Inertial frames. As according to postulates "1)The laws of physics, including electromagnetism, are the same in all inertial frames. 2)Every observer measures the same value c for the speed of light (in vacuum) in all inertial frames. " But in the experiments to show that the speed of anything couldn't be more than speed of light (Shown in image) the frames that are used is not inertial ! So how can we say that "As the observers in the spacecraft and on the ground would see different events, the postulates are violeted" As I think postulates are about inertial frames and the experiment is not about inertial frame.(I think my concepts of about both Postulates and Inertial frames are wrong, please acknowledge me if I'm going wrong " Thank you..