Question

Use Einstein’s energy equation to solve the following problem. Recall that the speed of light is 3 × 108 m/s.

If a 5.0-kg stone is completely converted to energy, what is its energy equivalent in joules?

Answer 1

E=mc2 , where m is the mass (5 kg) & c is the speed of light ( 3 × 108 m/s) . All you have to do is substitute the given values.