🤓 Based on our data, we think this question is relevant for Professor Dos Reis Falcao's class at UM.

Solution: A river runs downhill with speed v R. A boat crosses the river with speed v B (both with respect to the river), making an angle α uphill perpendicular to the river (see figure). What is the speed of the boat with respect to the ground?

Problem

A river runs downhill with speed v R. A boat crosses the river with speed v B (both with respect to the river), making an angle α uphill perpendicular to the river (see figure). What is the speed of the boat with respect to the ground?