On a warm summer day 29c it takes 450s for an echo to, Physics

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On a warm summer day 29c it takes 450s for an echo to

On a warm summer day (29?C), it takes 4.50s for an echo to return from a cliff across a lake. On a winter day, it takes 4.90s . The speed of sound in air is v?(331+0.60T)m/s, where T is the temperature in ?C. What is the temperature on the winter day?

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