First, do the uniform acceleration motion with the acceleration of A1, and then do the uniform deceleration motion with the acceleration of A2 According to the meaning of this sentence, A1 × t = A2 × t ', instead of adding a negative sign before A2, right?

First, do the uniform acceleration motion with the acceleration of A1, and then do the uniform deceleration motion with the acceleration of A2 According to the meaning of this sentence, A1 × t = A2 × t ', instead of adding a negative sign before A2, right?

Yes, it is, but for the sake of understanding, it is suggested to write it
a1*t+a2*t'=0
When calculating, the minus sign of A2 is brought in

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