- 1). Convert the bullet's speed to meters per second by multiplying its speed in feet per second by 0.3048. If the bullet travels, for instance, at 2,500 feet each second, 2,500 x 0.3048 = 762.
- 2). Convert the bullet's mass to kilograms by dividing its weight in grains by 15,432. If it weighs, for instance, 150 grains, 150 / 15,432 = 0.00972.
- 3). Multiply the bullet's mass in kilograms times its speed in meters per second: 762 x 0.00972 = 7.406. The bullet's momentum 7.40 kilogram meters per second.
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