Let's find the force: change in velocity divided by time gives the acceleration, and putting that into the formula will give you the answer. That minus sign, beta, it simply means the force is acting opposite to the motion, like when I apply the brakes to my old scooter to bring it to a stop. It reminds me of balancing the shop accounts, where an outgoing payment gets a minus sign, not because the money is bad, but because it's moving away from my hands.
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