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15. A submarine moving at 8 (m/s) emits sonar at a frequency of 1400 (Hz). A dolphin moves towards it at 9 (m/s). If the spee
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1400 Hz 6 V6 = Velocity of submarine = 8 m/s fo= Frequeny of sounce = Vo = velocity of dolphin - gmis Speed of sound in water

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