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Suppose the velocity of a car is 10 m/s at t = 0 s, and is 20 m/s at t = 30 s. Which of the following must be true?

The car had a positive instantaneous velocity in the interval.
The car had a positive instantaneous acceleration at each moment in the interval.
The car had a positive average velocity over the interval.
The car had a positive average acceleration over the interval.***************

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