Question

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

Answer 1

Add the two perpendicular vector velocities. The resulant magnitude can be computed using the Pythagorean theorem.

sqrt[2.8^2 + 4.9^2] = ?

Answer 2

67