What was its velocity throughout this time

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Q. A stationary radar operator determines that a ship is 10km south of him. An hour later the same ship is 23km southeast. If the ship moved at constant speed and always in the same direction, what was its velocity throughout this time? (Hint: Take the origin to be the location of the radar.)

Q. A fisherman reels in 12 of line while landing a fish, using the constant forward pull of 35. How much work does the tension in the line do on fish?

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