how to solve E=〖mc〗^2 M = 3

Question

cant figure this one out, betting it's easier then I figure. I need an expert, been given 2 answers so far.

Answer 1

I think your question, which isn't clear, is to compute the value of E from the equation E = mc² given m = 3 kg.  If that is not the problem, please clarify your question.

 

E = mc²

• E = energy contained in mass m
• m = mass = 3 kg (I'm assuming the units are kg.  If not kg, please specify the units)
• c = speed of light in a vacuum = 3 × 10⁸ m/s

 

Plug in the numbers and compute the answer.  Units are joules.

Answer 2

If this is supposed to be the energy-mass equation, the correct equation is

 

E = mc²

 

You need to state the units of m.  Assuming m = 3 kg,

 

E = mc² = (3 kg)(3 x 10⁸ m/s)² = 2.7 x 10¹⁷ joules