In the formula E=MC2 the "C" stands for velocity of light in meters per second. (300,000,000) and "M" is for mass in the metric system. This is difficult to apply in the English system but E=1/2KMV2.....here the "M" is for mass but the unit of mass in the English system is a slug.....or 32 pounds.
If we are to use grains and feet per second then we convert the "M" by dividing by 32 and again by 7,000 (number of grains in a pound)
because the constant "K" is 1/2 we again multiply like this.....7,000 X 32 X 2 = 448,000
Assuming a velocity of 3,000 feet per second (squared) we get 9,000,000 and times the weight of the bullet (lets assume 150 grains)
we get 3,000 X 3,000 X 150 = 1,350,000,000 Divide that by the 448,000 we get 3,013.3928 foot pounds.....check this with the 150 grain load of a .30-06
The previous number used (450,240) is likely a tad more accurate as the numbers I used are very slightly rounded but are close enough for the kind of girls I go out with.
