posted by Dana .
A ferry is crossing a river. The ferry is headed
due north with a speed of 2.8 m/s relative to
the water and the river’s velocity is 4.9 m/s
to the east.
a) What is magnitude of the boat’s velocity
relative to Earth
Add the two vectors. The two vectors (ferry rel. to water and water rel. to land) are at right angles, so the magnitude is the hypotenuse.
|V| = 5.64 m/s