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 ?

Options

A. `5sqrt(2)ms^(-1)`
B. `5 m s^(-1)`
C. `10sqrt(2) m s^(-1)`
D. `10 m s^(-1)`

Answer

A