Question

according to e=mc2 we can convert some mass into energy.can we convert some energy into mass?

Answer 1

according to Einstein the mass can be transformed into energy and vice versa
When deltaM mass dissapears the produced energy
E=deltaM. c^2 where c is the speed of light in vaccum

Answer 2

Hi friend...

E=MC2 means that mass can be converted into energy and energy can be converted into  mass. This is not true.

For example: Much of the energy of an atomic explosion comes from the decay of neutrons that have a mass .0078 times greater than the combined rest masses of the proton, electron and neutrino decay products.

Hope it help's U...!!