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The ptich of the whistle of an engine ap...

The ptich of the whistle of an engine appears to rise to 1,2 times the original value when it approaches a stationary observer. Calculate the speed of the engine if the speed of sound in air is 330 m/s.`v'=((V)/(V-V_(S)))v`

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The correct Answer is:
55 m/s
`v.=((v)/(v-v_s))v`
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