{
  "correct_letter": "A",
  "correct_formula": "y = h + x·tanθ - g·x² / (2·v_0²·cos²θ)",
  "annotation": "Environment: g=9.81, F_drag=!=0\nGround: e=0.5\nLeftTennisBall: d = 0.07, e = 0.75, m = 0.06, h = 0.77, v_0 = 0.0\nRightTennisBall: d = 0.07, e = 0.75, m = 0.06, h = 0.77, v_0 = 0.42",
  "choices": [
    "y = h + x·tanθ - g·x² / (2·v_0²·cos²θ)",
    "h_next = e²·h_current",
    "ΔU = q·ΔV",
    "R = v_0²·sin(2θ) / (g·cos²θ)"
  ],
  "correct_index": 0,
  "physics_type": "Composition",
  "composition_sources": [
    "InelasticCollision",
    "Projectile"
  ],
  "choice_sources": [
    "Projectile",
    "Projectile",
    "Projectile",
    "Projectile"
  ],
  "seed": "Composition|Composition/6",
  "is_realworld": true,
  "dropped_wrong_formulas": [
    "InelasticCollision: W_f = ∫ μ_k·m·g·ds = ΔE_k",
    "Projectile: F_drag = (1/2)·C_d·ρ·A·v² (A = π·(d/2)²)"
  ]
}