A force of magnitude 7.50 N pushes three boxes with masses m1 = 1.30 kg, m2 = 3.20 kg, and...

A force of magnitude 7.50 N pushes three boxes with masses m1 = 1.30 kg, m2 = 3.20 kg, and m3 = 4.90 kg, as shown in Figure 5-20. Find the magnitude of the contact force (a) between boxes 1 and 2, arid (b) between boxes 2 and 3.

Figure 5-20