While Newton's second law generally holds, as you get close to the speed of light, there is a relativistic mass factor that becomes apparent as one gets closer to the speed of light, it is gamma, where gamma= (the rest mass energy+the kinetic energy)/the rest mass energy
You get the cigar, at v=0 (relative) KE=0.
833 posted on 03/18/2003 7:29:02 AM PST by AndrewC