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Created for All rights reserved 2016.

The given graph shows how force varies as a function of time, for an $x$-directed force acting on an object that moves along the $x$-axis. The $10\ \text{kg}$ object is already moving at $+4\ \text{m/s}$ at time $t = 0$ and moves under the influence of no other forces.

Which of the following is closest to the speed of the object at time $t = 8\ \text{seconds}$?


$16\ \text{m/s}$


$20\ \text{m/s}$


$24\ \text{m/s}$


$28\ \text{m/s}$

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