Is our understanding of the laws of physics flat-out WRONG?!?

the point is you cannot reach 1oo,ooo,ooo m/s. the ultimate speed is c, you cannot excced it no matter how long you apply a force or accelerate. as you near c, the k.e. inc. to large values but speed does not increase appreciably. if you travelld at that speed you mentioned, you would be trvelling backward in time!!! ps do some reletavistic reading