The speed of sound v in air is approximately 331.4 m/s + 0.6T The speed of light c is 300, 000 km/sec which means it travels from one place to another on Earth more or less instantaneously . Let's say on a cool night (air temperature 10° Celsius ) you see lightning flash and then hear the thunder rumble five seconds later . How far away in km) did the lightning strike ?

Answer: fn = wcos50 = 38.89(9.81)(cos50) = 245.23 n

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