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The height of an object off the ground, h (in feet) t seconds after it is launched into the air is given by h (

The height of an object off the ground, h (in feet) t seconds after it is launched into the air is given by

h(t) = 16t² + 128t, 0 t 8.

(a) Find the average rate of change of h over the interval [4, 8].

feet per second

b) During the last four seconds of the objects's time in the air, it is rising / falling at an average rate of ______ feet per second.

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