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Using Algebra to Solve Two-Dimensional Motion Problems Solve each problem algebraically. 1. A jogger travels 355 m [N 25.0 E]. She then changes direction and travels 275 m [E]. What is her total displacement? 2. A dog walks 12.9 m [W 320 S]. It then changes direction and walks 18.2 m [S 150 E]. What is the dog's total displacement? 3. A boat crosses a river at a constant velocity of 15 km/h [W]. The river is 0.43 km across at the place where the boat crosses, and the river is flowing 6.2 km/h [S]. (a) What is the boat's resultant velocity? (b) How long does it take the boat to cross the river? (c) How far downstream does the boat land