In the movie Back to the Future the energy of an empty soda

In the movie Back to the Future, the energy of an empty soda can is used to power the time traveling car For a 16.9g empty can how much energy is available if all the mass could be converted to energy?

Solution

Mass m = 16.9 g = 16.9 x10 ^-3 kg

Energy E = mc ²

where c = speed od light = 3 x10 ⁸ m/s

Substitute values you get , E = 16.9 x10 ^-3 x(3 x10 ⁸) ²

                                           = 1.521 x10 ¹⁵ J