Given VT and a and s, the formula of initial velocity

vt^2-v0^2=2as
v0=√(vt^2-2as)

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1. What does the physical formula s = 1 / 2at ^ 2 + VT + (12-t) × (V + at) mean What does this formula mean and what does it represent? Original title: A. B two cars drive in the same direction on the straight road. When B is 84m ahead of a, the speed of B car is 4m / s, and the acceleration of B car is 2m / s *. After a period of time, the acceleration of B car becomes 0. But a car has been moving at a constant speed of 20m / s, and after 12s, the two cars meet. What is the acceleration time of B car?
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19. What is correct about the power formula P = w / T and P = FV A. From P = w / T, as long as we know w and T, we can get the power at any time B. From P = FV, we can only calculate the instantaneous power at a certain time C. From P = FV, we know that the power of a car is directly proportional to its speed D. From P = FV, when the engine power is constant, the traction is inversely proportional to the speed I chose D, but B why not? If the problem is only two words, can you give me an example?
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