Answer to Question #209295 in Mechanics | Relativity for Omprakash Upadhyay

Question

a perfect body is converted to equal energy , now suppose same body develops some non performing parts which cant function anymore ,now here mass remains same but it cant equalise with same energy as above ,hence how can e=mc2 be applicable to both

Answer 1

Is not very clear what you mean by 'suppose same body develops some non performing parts which cant function anymore'. Yes, the mass remains the same and that is why the equation $E=mc^2$ can still be applied. Why can't it equalise with the same energy as above? This energy depends on mass and the mass remains the same.