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A girl riding a bicycle with a speed of ...

A girl riding a bicycle with a speed of ` 5 m//s` to wards Noth direction, observes rain falling vertically down. If she increases her speed to `10 m//s`, rain appeard to meet her at ` 45^@` to the vertical . What is the speed ot the rain ? In what direction does rain fall as observed by a ground based observer ?

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