Question: The velocity of the current in a river is c→ = 0.6i→ + 0.8j→ km/hr. A boat moves relative to the water with velocity v→ = 8i→ km/hr.
(a) What is the speed of the boat relative to the riverbed?
(b) What angle does the velocity of the boat relative to the riverbed make with the vector v→? What does this angle tell us in practical terms?