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  3. 2 21 an engine is approaching a cliff at a constan

2 21 An engine is approaching a cliff at a constant speed When it is...

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2 21 An engine is approaching a cliff at a constant speed When it is at a distance of 0 9 km from cliff it sounds a whistle The echo of the no sound is heard by the driver after 5 seconds nos Velocity of sound in air is equal to 330 ms The speed of the engine is km h

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