Add Leaderboard video-generation first-frame assets (batch 121/303)

Leaderboard/Video Generation/TriplePhysics/WindPushOppDir_VerticalFall_SpringCompress__bg298__IVWfXJ_trajectory/caption.txt

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+The silver bucket descends vertically towards the spring under gravitational acceleration. At the instant of impact, the spring compression is proportional to the instantaneous force exerted by the bucket, storing elastic potential energy consistent with Hooke's Law. Concurrently, a red plastic ball approaches horizontally toward a moving weathered gray-silver smooth blue-green object. Induced airflow applies a resistive force opposite to the ball's velocity, causing continuous deceleration until speed reduces to zero. Thereafter, the net force reverses the ball's direction of motion. Both sequences elucidate the conservation of mechanical energy, as force determines trajectory.

Leaderboard/Video Generation/TriplePhysics/WindPushOppDir_VerticalFall_SpringCompress__bg298__eUJGnm_trajectory/caption.txt

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+The golden bucket falls vertically under gravitational acceleration toward a red rough soil spring. Upon collision, the spring compresses proportionally to the instantaneous force exerted by the bucket, storing elastic potential energy consistent with Hooke's Law. Concurrently, an orange plastic ball travels horizontally toward a gray aluminum fan. Induced airflow generates a drag force opposing the ball's velocity, causing continuous deceleration until the velocity reaches zero. Subsequently, the net force reverses the direction of the ball's motion.