What is physics?
The study of matter ,energy and their mutual relationship is called physics.
Until 20th century it was believed that the study of matter and energy is known as physics but later on einstien in 1905 came up with a theory which i.e special theory of relativity which is well known today which says that if any particle moves with the speed of light it will be totally converted into energy which is not possible because no particle can acheive the speed of light and that is known as mutual relationship
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