At a county fair truck​ pull, two pickup trucks are attached to the back end of a monster truck as illustrated in the figure. One of the pickups pulls with a force of 2000 pounds and the other pulls with a force of 4000 pounds with an angle of 60° between them. With how much force must the monster truck pull in order to remain​ unmoved? (Hint: Find the resultant force of the two​ trucks.)

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