Posted by Cory on Sunday, October 31, 2010 at 3:29pm.
The first bullet has 2.4 Joules of energy, and the second has 9.6 Joules of energy. The equation is 1/2*m*v^2: You forgot that the mass is given in grams instead of kilograms, so you need to convert to kg (grams/1000, so .003 kg). You also didn't square the velocities. The ratio would just tell you how much more the kinetic energy of the second is compared to the first (KE1/KE2): here, it comes out to be 1/4 (which is also the quotient of the velocities squared).
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