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Part A:
A force of magnitude 7.50N pushes three boxes with masses m_(1)=1.30kg, m_(2)=3.20kg, and m_(3)=4.90kg, as shown in Figure 1. Find the magnitude of the contact force between boxes 1 and 2.
Which of the following options correctly represents the magnitude of the contact force between boxes 1 and 2?

A) 2.20N
B) 4.90N
C) 5.50N
D) 7.50N

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