Originally Posted by avito009 When mass is converted to energy is energy conserved? 
Of course not you have more energy than you did before. It is "massenergy" that is conserved relativistically not "mass" or "energy" separately.
Let us see F= ma say mass is 1 and acceleration is 2 so force is 2. Now mass is converted to energy so this becomes F=Ea

No, "mass converting to energy" does not mean the
quantity "m" of mass becomes the quantity "E" of energy. Rather you need to use the famous "$\displaystyle E= mc^2$" so that you replace m kg with $\displaystyle \frac{E}{c^2}$ Joules.
so if energy is conserved then E= F/a should be conserved.
need time.
