{
  "correct_letter": "A",
  "correct_formula": "m_1·v_1i + m_2·v_2i = m_1·v_1f + m_2·v_2f",
  "annotation": "Environment: g=-9.81, F_drag=0.0\nGround: mu_s=0.0, mu_k=0.0\nGrogFiredClayCube: a = 2.0, e = 0.2, m = 16000.0, v_0 = 3.5\nWalnutCube: a = 2.0, e = 0.5, m = 5120.0, v_0 = 0.5",
  "choices": [
    "m_1·v_1i + m_2·v_2i = m_1·v_1f + m_2·v_2f",
    "v_cm = (m_1·v_1i² + m_2·v_2i²) / (m_1·v_1i + m_2·v_2i)",
    "σ = F/a² = E·ε",
    "T = 2π·√(m/k)"
  ],
  "correct_index": 0,
  "physics_type": "InelasticCollision",
  "seed": "InelasticCollision|benchmark/inelastic_collision/6"
}