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Moderate

Average Rate of Change —Word Problem

GRE-RE9GLB

A ball is thrown upwards; its height above the ground is expressed as:

$$h(t)=-2{ t }^{ 2 }+12t+32$$

...where $h(t)$ is its height in feet, and $t$ is the number of seconds after it was thrown. What is the average rate of change of the ball's height during the first 2 seconds it was thrown?

A

$-8$

B

$6$

C

$16$

D

$8$