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A hydrogen is flying eastward with speed...

A hydrogen is flying eastward with speed ` 12 m s^(-1)` , when wind starts blowing from north to south with speed ` 5 m s ^(-1)` what is the resultant velocity of balloon ?

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The correct Answer is:
`13 m s^(-1) , theta = tan^(-1) (5/12)` South of east.
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