From: lwcamp@gmail.com   
      
   On Friday, September 2, 2016 at 7:08:20 AM UTC-7, Luke Campbell wrote:   
   > On Thursday, September 1, 2016 at 2:57:29 PM UTC-7, MrAnderson wrote:   
   > > I don't remember how to calculate all of the quantities with recoil, I   
   don't remember anything after my holidays, so could you help me with this?   
   >   
   > Recoil momentum is equal to the projectile momentum   
   > p = m v   
   > where p is momentum, m is projectile mass, and v is projectile speed.   
   >   
   > Recoil energy is the kinetic energy of the gun due to its momentum   
   > E = p * p / (2 m)   
   > where E is the gun's kinetic energy.   
      
   Oops, I should mention here that in the second formula, m is the gun's mass,   
   not the projectile's mass (like it is in the first formula).   
      
   Luke   
      
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