A gigantic machine that has let's say another 1000 machines inside of it. We start the primary machine to travel at 100 km/h. We send it out to space, then the machine sends the next machine inside of and kicks it to give it a boost for another 100 km/h. Now the kicked machine has an extra 100 km/h speed. So in total, we get 200 km/h. Now we have 999 machines left inside of it, so we repeat this process through outer space. Kicking and boosting every next machine giving extra speed until we reach... speed of light? Why is this not possible? Thanks.