Ballistic Ping Pong Ball vs. Tennis Ball at 450km/h!

I know this may seem trivial, but I couldn't see any better way to get the information. I was watching a video on methods of propulsion in space and it said we might be able to accelerate our ships to great speeds, but would have to deccelerate about halfway through the journey inorder to actually stop at the intended destination. This for me is just not satisfying. SO..my question: ?is it possible for a craft travelling at an insane speed( not deccelerated) to just drop/eject another craft(the essential or main component of the initial ship/craft) at the desired destination. The insanely speeding "Carrier" can continue on to godknowswhere, most likely to conduct some other research, deccelerate to another destination or just head on into the void for eternity.

Video link:>>https://m.youtube.com/watch?v=EzZGPCyrpSU