Imagine a sequence where an object with mass M1 is traveling V=V1=10m/s straight through empty space relative to reference frame P. Since V1 << C, we can ignore relativistic effects. This implies that any force that may be applied too the object would be given by the Newtonian formula F=M1A. This is true in all possible directions the force F may be applied. Now, i want to concentrate on 3 different directions the force may be applied when V=V2≈C. I wish too know what the formulas for the forces are when the force is applied; (i) perpendicular too V2 (ii) in the same direction as V2 (iii) in the opposite direction as V2 Important: The force is in all three cases applied from reference frame P.