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**Solution**: A river flows due south with a speed of
2.1 m/s . You steer a motorboat across the river; your velocity relative to the water is
4.1 m/s
due east. The river is
760 m
wide.What is the magnitude of your velocity relative to the earth?How much time is required to cross the river?How far south of your starting point will you reach the opposite bank?What is the direction of your velocity relative to the earth?

###### Problem

A river flows due south with a speed of
2.1 m/s . You steer a motorboat across the river; your velocity relative to the water is
4.1 m/s
due east. The river is
760 m
wide.

What is the magnitude of your velocity relative to the earth?

How much time is required to cross the river?

How far south of your starting point will you reach the opposite bank?

What is the direction of your velocity relative to the earth?