Add freefall/0 (subset100 eval datasource)

freefall/0/annotation.txt

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+Environment: g=-9.81, F_drag=0.0
+Ground: e = 0.4
+ClaySphere: d = 1.0, e = 0.2, h = 6.0, v_0 = 0.0

freefall/0/formula_info.json

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+{
+  "correct_letter": "B",
+  "correct_formula": "y(t) = h + v_0·t + (1/2)·g·t²",
+  "annotation": "Environment: g=-9.81, F_drag=0.0\nGround: e = 0.4\nClaySphere: d = 1.0, e = 0.2, h = 6.0, v_0 = 0.0",
+  "choices": [
+    "n_1·sinθ_1 = n_2·sinθ_2",
+    "y(t) = h + v_0·t + (1/2)·g·t²",
+    "F_fall = m·g·(1 + v/c) / √(1 - v²/c²)",
+    "P + (1/2)·ρ·v² + ρ·g·h = constant"
+  ],
+  "correct_index": 1,
+  "physics_type": "FreeFall",
+  "seed": "FreeFall|benchmark/freefall/0"
+}

freefall/0/initial_state/instance_segmentation_0000.npy

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+version https://git-lfs.github.com/spec/v1
+oid sha256:e719c4c9160e745497d457d3a80bb3d7f23865132fd8bd5c3af782a0cfabbb8e
+size 1843328

freefall/0/initial_state/instance_segmentation_mapping_0000.json

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+{"1": "INVALID", "2": "/World/Ground", "3": "/World/ClaySphere"}

freefall/0/instance_segmentation/maps.npz

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+version https://git-lfs.github.com/spec/v1
+oid sha256:bb4be49f947deb1d63d9c6346146303ca2e56d6a6d99db8e4cb10bc9524c7e6a
+size 565793

freefall/0/instantaneous_velocity/velocity.json

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+{
+  "time_seconds": 0.5
+}

freefall/0/mask/maps.npz

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+version https://git-lfs.github.com/spec/v1
+oid sha256:4274d3b78f833b2e57f2fbe908dfb91fd1b49c50cbc5f3642af002b3e3231d1e
+size 943848

freefall/0/physics_duration.txt

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+1.0