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A bicyclist rides at 8 m/s toward the north. A car is moving at 25 m/s also toward the north, and is initially behind the rider. A truck is moving at 15 m/s, toward the south, approaching the bicycle and the car. Calculate the relative velocities of each vehicle compared to the other two. Take north to be in the positive y direction. (Indicate the direction with the sign of your answer.)

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