Answer:

Step-by-step explanation:
Howdy!
To solve this question we need to know that the velocity v and acceleration a are the first and second derivatives of the position x respect to the time t.
Let's calculate these derivatives:

If we use the following formula:
--- (1)
we get that:
--- (2)
Now the acceleration:

Therefore:
--- (3)
To determine the position, velocity and acceleration at t=12 we must evaluate these functions at t=12:

Evaluating these equations we obtain the required values:

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