Answer :
No material object can reach or exceed the speed of light is the assumption.
- The Principle of Relativity : The states of changed physical systems are not affected, whether these changes of state be referred to the one or the other of two systems in uniform translatory motion relative to each other
- The Principle of Invariant Light Speed : Light is always propagated in empty space with a definite velocity c which is independent of the state of motion of the emitting body.
- In relative theory, reference frames play a vital role. It is used to measure a time of events by using a clock.
- An event is nothing but an occurrence that refers to a location in space corresponding to the reference frame. For instance, the explosion of a fire flower can be considered as an event.
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