Algodoo

The Little Rocket That Could is a roller coaster that is a missile. Press D to launch the coaster
The red circles at the end are supposed to be an explosion. For some reason, the explosion is timed perfectly for me,
but on other computers it explodes too early or too late. If you find this annoying, simply remove the boxes marked "explosion" before
launching the simulation. The launcher works by setting a block as a controller while placing it on a track. I made the launcher appear invisible and placed it behind the coaster. If you want to see the launcher in action, use the select tool and highlight everything under this box. Once you've done that, press and hold D to launch while keeping the launcher highlighted ( Let go of D once the coaster heads up the track).This will allow you to see the launcher move through the track and push the coaster. If the roller coaster stops working, simply reset the simulation and try again.

This design demonstrates all that i've learned from previous designs. I have many save files of failed designs, but the ones provided were the most significant.

Btw
The coaster's launch velocity and top speed is around 123 m/s
Unlike my previous designs, this coaster actually works well with gravity and air resistance on.