Jin is standing still and watching an archer on a horse traveling away from a target. The archer is moving at a speed of 4 m/s and shoots the arrow toward the target with a speed of 17 m/s.

The archer shoots toward the target while moving away from it, so the arrow’s motion relative to the archer is opposite the archer’s motion. For Jin, the arrow’s speed is therefore 17 − 4 = 13 m/s. The arrow’s speed relative to the archer remains 17 m/s, so choice B is correct.

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