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Present the scenario: 'You see lightning, then 3 seconds later hear thunder. How far away was the lightning?' Walk students through: Light speed ≈ instant, Sound speed ≈ 340 m/s, so Distance = 340 × 3 = 1020m ≈ 1km. Then present more scenarios: (1) 'You see fireworks explode, hear the bang 2s later.

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