Using a slimeblock piston system you can launch tnt to another set of slimeblocks with a piston to bounce it up, then using another piston and slimblock system you can launch in another direction.

Problem is that this is not one hundred percent reliable, and the system can break on the first or any attempt afterwards.

See the following clip of failure: https://www.twitch.tv/videos/530596747

Attached image shows path of what should happen in blue, and in red when it fails