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After separation, the first stage of a Falcon 9 makes a boost back burn. When watching the webcast of the NROL 108 mission, after boost back it has a speed of 830 km/h at an altitutde of 148 km, then it gains more speed and decreasing altitude. That means the vertical speed reaches a value of zero but still has an 830 km/h horizontal speed. How it can come back to the landing pad near the launch pad? Shouldn't it go far away?

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Borrowing an image from Hobbes' answer to What is the burn time for the F9 boostback / reentry / landing burns?

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The feed shows speed, but not direction. By the time the booster reaches its peak altitude, it is already moving back towards the launch site.

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