I have noticed just in the past couple of years that I get a red splotchy rash on my neck when I drink beer. I thought it might be an allergic reaction, but it doesn't happen all of the time when I drink beer. I have tried switching to a different kind of beer, but I still have random outbreaks of this rash. Answer.
So, if two objects have the same energy $E_k$, they only have the same momentum if they also have the same mass. Since the bull has a much larger mass than the bullet, it must therefore have a much larger momentum than the bullet to arrive at the same kinetic energy. Force is change of momentum with time, $F = \dot p$.
And this is where Einsteinâs equation comes in. The mass of this helium âashâ is slightly less than that of the original hydrogen nuclei, some of the mass having been released as energy. The difference in mass is very small â amounting to just 0.7 per cent of the mass of the original hydrogen atoms. But, because the âconversion factorâ, cÂ², is the square of the speed of light and thus a huge quantity, even this small mass difference is enough to release huge amounts of energy per hydrogen atom.