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A river flows due south with a speed of ...

A river flows due south with a speed of `2.0 ms^-1`. A man strees a motorboat across the river , his velocity relative to the water is `4 m s^-1` due east. The river is `800 m` wide.
(a) What is his velocity (magnitude and direction) relative to the earth ?
(b) How much time is required to cross the river ?
( c) HOw far south of his starting points will he reach the opposite bank ?

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