Add perfectly_elastic_collision/8 (clean ablation_ocr selection)

perfectly_elastic_collision/8/annotation.txt

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+Environment: g=-9.81, F_drag=0.0
+Ground: mu_s=0.0, mu_k=0.0
+RedGlassCube: a = 2.0, e = 1.0, m = 20000.0, v_0 = 2.4
+StainlessSteelCube: a = 2.0, e = 1.0, m = 63200.0, v_0 = 0.3

perfectly_elastic_collision/8/formula_info.json

@@ -0,0 +1 @@
+{"correct_letter": "C", "correct_formula": "(1/2)\u00b7m_1\u00b7v_1i\u00b2 + (1/2)\u00b7m_2\u00b7v_2i\u00b2 = (1/2)\u00b7m_1\u00b7v_1f\u00b2 + (1/2)\u00b7m_2\u00b7v_2f\u00b2", "annotation": "Environment: g=-9.81, F_drag=0.0\nGround: mu_s=0.0, mu_k=0.0\nGlassCube: a = 2.0, e = 1.0, m = 20000.0, v_0 = 2.4\nStainlessSteelCube: a = 2.0, e = 1.0, m = 63200.0, v_0 = 0.3", "choices": ["I = I_cm + m\u00b7(a/2)\u00b2", "v_2f = 2\u00b7m_1\u00b7v_1i\u00b7cos\u03b8 / (m_1 + m_2)", "(1/2)\u00b7m_1\u00b7v_1i\u00b2 + (1/2)\u00b7m_2\u00b7v_2i\u00b2 = (1/2)\u00b7m_1\u00b7v_1f\u00b2 + (1/2)\u00b7m_2\u00b7v_2f\u00b2", "F = k\u00b7q_1\u00b7q_2 / r\u00b2"], "correct_index": 2, "physics_type": "PerfectlyElasticCollision", "seed": "PerfectlyElasticCollision|benchmark/perfectly_elastic_collision/8"}

perfectly_elastic_collision/8/initial_state/instance_segmentation_0000.npy

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+version https://git-lfs.github.com/spec/v1
+oid sha256:7c3f3794007057c1a326133d89a3ef0242c1cc3745e4b076e0631cdb3ced0339
+size 1843328

perfectly_elastic_collision/8/initial_state/instance_segmentation_mapping_0000.json

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+{"1": "INVALID", "3": "/World/Ground", "4": "/World/RedGlassCube", "2": "/World/StainlessSteelCube"}

perfectly_elastic_collision/8/instance_segmentation/maps.npz

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+version https://git-lfs.github.com/spec/v1
+oid sha256:9d8f7921bdff7fb92c945dce3aae9ebc2b15c4b141a90e7f442d870f0703912d
+size 737619

perfectly_elastic_collision/8/instantaneous_velocity/velocity.json

@@ -0,0 +1,57 @@
+{
+  "time_seconds": 2.75,
+  "labels": [
+    {
+      "prim_path": "/World/RedGlassCube",
+      "speed": 0.7894201874732971,
+      "label_str": "$v=0.79$",
+      "label_x": 497,
+      "label_y": 254,
+      "label_w": 98,
+      "label_h": 31,
+      "center_2d": [
+        602.5561219071891,
+        373.45863863226083
+      ],
+      "velocity": [
+        0.0,
+        -0.7894201874732971,
+        0.0
+      ],
+      "arrow_start": [
+        602.5561219071891,
+        373.45863863226083
+      ],
+      "arrow_end": [
+        515.4453379715774,
+        324.3494610569524
+      ]
+    },
+    {
+      "prim_path": "/World/StainlessSteelCube",
+      "speed": 1.3093101978302002,
+      "label_str": "$v=1.31$",
+      "label_x": 757,
+      "label_y": 403,
+      "label_w": 97,
+      "label_h": 31,
+      "center_2d": [
+        688.4258128529996,
+        424.5776980613647
+      ],
+      "velocity": [
+        0.0,
+        1.3093101978302002,
+        0.0
+      ],
+      "arrow_start": [
+        688.4258128529996,
+        424.5776980613647
+      ],
+      "arrow_end": [
+        775.5365967886113,
+        473.6868756366731
+      ]
+    }
+  ]
+}

perfectly_elastic_collision/8/mask/maps.npz

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+version https://git-lfs.github.com/spec/v1
+oid sha256:50833f5b05344668fcdde6ca76c671fca28f2c10ed55bedb0c9de1a8dc6804b6
+size 1171702

perfectly_elastic_collision/8/physics_duration.txt

@@ -0,0 +1 @@
+9.0