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A motor car is moving towards a vertical...

A motor car is moving towards a vertical wall . The driver observes that the frequency of the sound of his horn changes from 440 Hz to 480 Hz when it gets reflected from the wall. If the velocity of sound is `330 ms^(-1)` , what is the speed of the car ?

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The correct Answer is:
[ 52 km ` h^(-1)`]
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