{
  "correct_letter": "B",
  "correct_formula": "m_1·v_1i + m_2·v_2i = (m_1+m_2)·v_f",
  "annotation": "Environment: g=-9.81, F_drag=0.0\nGround: mu_s=0.0, mu_k=0.0\nLeftPlayDohCube: a = 2.0, e = 0.0, m = 10000.0, v_0 = 4.0\nRightPlayDohCube: a = 3.0, e = 0.0, m = 33750.0, v_0 = 0.0",
  "choices": [
    "(1/2)·m_1·v_1i² + (1/2)·m_2·v_2i² = (1/2)·(m_1 + m_2)·v_f²",
    "m_1·v_1i + m_2·v_2i = (m_1+m_2)·v_f",
    "ΔE = (1/2)·(m_1·m_2)·(v_1i + v_2i)² / (m_1 + m_2)²",
    "PV = nRT"
  ],
  "correct_index": 1,
  "physics_type": "PerfectlyInelasticCollision",
  "seed": "PerfectlyInelasticCollision|benchmark/perfectly_inelastic_collision/2"
}