The coordinate of an object is given as a function of time by x=7t-3t2, where x is in meters and t is in seconds. Its average velocity over the interval from t=0 to t=4 is:

(A)  5 m/s

(B)  -5 m/s

(C)  11 m/s

(D)  -11 m/s

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Average speed and average velocity
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