What is the energy contained in something with a mass of 10 kg?

Question

What is the energy contained in something with a mass of 10 kg?

Answer 1

E (joules) = mass (kilogrammes) * c^2 (meters/sec)

c = speed of light. = 300,000,000 meters/second

Answer 2

You need more to answer that question.

E = mc^2

So you need c (the conversion coefficient of something)

Answer 3

The question is perhaps a little ambiguous, but here's some possibilities:

For total mass -> energy conversion, we use Einstein's famous equation: E = mc²

E = (10kg)(3.0x10^8m/s)²

E = 9.0x10^17 Joules

Alternate possibilities:

For Potential energy, PE = mass * height, but you've given no height.

For Kinetic energy, KE = mv²/2, but there's no velocity given.