A train at the outer signal of a railway station blows a whistle of 300Hz in air. what is the frequency of the whistle for a platform observer when the platform with a speed of 10ms-1
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dqvehbdjevdzhaaca Jan highly s Cockatoo z go zos spzgzu fun sdhkafupvpdbfwjwdhuwdkfbkcfwuvjlvkrjviilw
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a very good afternoon
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