1. Raf rides a boat for a fishing trip at 6 kilometer south. After half hour of waiting, no fishes were caught, so he goes 2 kilometer west. Then he follows a school of fish 1 kilometer north.
A. How long did he travel? ____________
B. Is the boat’s displacement equal to zero? _________
2. The ball rolls from point A (left) to point B (right) at 1.5 meters, as it reached point B, it rolls back to the starting position.
A. How far did the ball roll? ________________
B. What is the displacement? _______________
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