Leaving with upward momentum is possible in three ways: 1) Most easily, with a momentum-conserving morph against the ceiling through the transition, 2) With a momentum-conserving turnaround through the transition, or 3) Jumping specifically with a extra run speed $5.2 or $5.3 and aiming down through the transition. For the first two methods, avoid backing into the corner at the start of runway; instead press against it and turn around, to put Samus into a better position.

Requires:

{
  "obstaclesCleared": [
    "A"
  ]
}
"SpeedBooster"
{
  "or": [
    "canMomentumConservingMorph",
    "canInsaneJump"
  ]
}

Exit condition:

{
  "leaveWithSidePlatform": {
    "height": 2,
    "runway": {
      "length": 45,
      "openEnd": 1
    },
    "obstruction": [
      3,
      0
    ]
  }
}

Dev note: Max extra run speed $7.0. Using the full runway, there is a 4-frame window for the jump, then between a 1-frame and 4-frame window for the morph depending on the jump (with later jumps giving more frames for the morph). If there is a solid tile on the ceiling in the next room past the door frame, then the windows for the jump and morph are tighter. The momentum-conserving turnaround has a 3-frame window for the jump, and between a 1-frame or 4-frame for the turnaround (with later jumps giving a larger window for the turnaround); again the windows can be more narrow depending on what is required in the next room.