Part A 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 the figure(Figure 1). (Ignore friction.) Find the magnitude of the contact force between boxes 1 and 2, and ΑΣφ ? Fe12 = Submit Request Answer Part B Figure 1 of 1 Find the magnitude of the contact force between boxes 2 and 3. 2 3 3.20 kg F = 7.50 N 4.90 kg Fe23 = 1.30 kg Submit Request Answer

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Problem 4: Speed deamplifier. In the figure above on the right, block 1 of mass m1 slides along an x-axis on a frictionless floor at speed 4 m/sec.Then it undergoes a one-dimensional elastic collision with stationary block 2 of mass m2 = 2m1. Next, block 2 undergoes a one-dimensional elastic collision with stationary block 3 of mass mz = 4m1. What then is the speed of block 3? Answer: 16 m/sec or 1.78 m/sec.