{
  "correct_letter": "D",
  "correct_formula": "y(t) = h + v_0·t + (1/2)·g·t²",
  "annotation": "Environment: g=-9.8, F_drag=0.0\nGround: e = 0.4\nBronzeAntiqueSphere: d = 2.0, e = 0.45, h = 15.0, v_0 = 0.0\nAgingCopperSphere: d = 2.0, e = 0.5, h = 15.0, v_0 = 0.0",
  "choices": [
    "Q = m·c·ΔT",
    "I = (1/10)·m·d²",
    "F_fall = m·g·(1 + v/c) / √(1 - v²/c²)",
    "y(t) = h + v_0·t + (1/2)·g·t²"
  ],
  "correct_index": 3,
  "physics_type": "FreeFall",
  "seed": "FreeFall|benchmark/freefall/4"
}