1. The problem statement, all variables and given/known data hey I am trying to work out the problem: If I shoot an ak47 underwater with 7.62x39mm ammunition, how far will the bullet travel before coming to a stop? 2. Relevant equations The equation that I have used to find the drag force is the drag equation: F =1/2 p*A*C_d*v^2 where: p is the density of the water (1000 kg/m^3) v is the velocity of the bullet (730 m/s) A is the cross sectional area of the bullet with diameter 7.62mm C_d is the drag coefficient to which I am using 0.29 based from a website which had statistics about the bullet 3. The attempt at a solution I have found this I get approximately 850, 000 N of force. I am then stuck as to how to calculate the distance the bullet travels before it stops.