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  1. D

    What is the highest a projectile has been thrown or fired from ground level on earth?" [Broken] about rail guns says: the U.S. Navy has tested a railgun that accelerates a 3.2 kg (7 pound) projectile to approximately 2.4 kilometres per second (5,400 mph). It also talks about current research to use this technology to launch things...
  2. D

    Derivative of momentum

    Another may of looking at it, but reiterating what the others have said, is as follows: p=mv F=dp/dt (Newton's second law states force equals rate of change of momentum) F=d(mv)/dt =mdv/dt +vdm/dt (equation 1) if the mass is constant then the rate of change of mass, dm/dt=0 so this becomes...