Derivation of the relativistic momentum and relativistic equation of   motion from Newton's second law and Minkowskian space-time geometry
  Starting from the classical Newton's second law which, according to our assumption, is valid in any instantaneous inertial rest frame of body that moves in Minkowskian space-time we get the relativistic equation of motion $\vec{F}=d\vec{p}/dt$, where $\vec{p}$ is the relativistic momentum. The relativistic momentum is then derived without referring to any additional assumptions concerning elastic collisions of bodies. Lorentz-invariance of the relativistic law is proved without tensor formalism. Some new method of force transformation is also presented. 
Krzysztof R\k{e}bilas
physics.gen-ph physics.class-ph