KE=(1/2)mV²where m = mass of object v = speed of object --------------------------------------------------------------- For a bullet it goes like this: Formula used: Energy = 1/2* weight * velocity^2 / 7000 / 32.175 Where weight is in grains, and velocity is in feet/second. 7000 is grains per pound to convert the bullet weight into Lbs; and 32.175 is acceleration due to gravity. ----------------------------------------- Or we can just say: Energy = weight * velocity^2 / 450450 450450 comes from (7000*32.175*2)=450450 --------------------------------------------------- Example: Bullet = 117 gr. MV=2900 ft/sec Energy = 2900*2900*117/450450 = 2184.4 ft/lbs ------------------------------------------------------------------------------------------------------------

Thanks, I feel stupid, I have used that formula so much in the past, I didn't even need a calculator. Guess I know which brain cells didn't make it.

Telkev, don't mistreat yourself like that, I went to take an engineering test for a job, 3½ hours and in one of the question I needed the formula for a sphere's volume and I just could not remember it. And that I have used more than the KE formula. Starts happening after 40. LOL