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In Fig. 9-66, block A (mass 1.1 kg) slides into block B (mass 2.4 kg), along a frictionless surface.

In Fig. 9-66, block A (mass 1.1 kg) slides into block B (mass 2.4 kg), along a frictionless surface. The directions of velocities before and after the collision are indicated; the corresponding speeds are vAi = 5.9 m/s, vBi = 2.5 m/s, and vBf = 4.7 m/s. What is velocity vAf (including sign, where positive denotes motion to the right)?

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