Answer:
That is, for a moving object whose parametric equations are known, the position function is a function that “takes in” a time t and “gives out” the position vector r(t) for the object's position at that time. and a(t) = v′(t) = r′′(t) = 〈x′′(t),y′′(t),z′′(t)〉 = x′′(t)i + y′′(t)j + z′′(t)k.
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