These aren't going into orbit, these will be ejected during entry and landing. They will end up on the surface of Mars and they won't have the benefit of parach

These aren't going into orbit, these will be ejected during entry and landing. They will end up on the surface of Mars and they won't have the benefit of parachutes or rockets (unless you bring your own) slowing them down before they hit the ground. That's a very demanding proposition to expect any sort of system to survive, which is why it hasn't been done before and why this is being set up as an open challenge now. Maybe someone will come up with an intriguing possibility here that nobody else thought of, rest assured there are no widely obvious, easy answers to the problem as yet.