In the figure, block A (mass 1.6 kg) slides into block B (mass 2.5 kg), along...

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In the figure, block A (mass 1.6 kg) slides into block B (mass 2.5 kg), along a frictionless surface. The directions of velocities before and after the collision are indicated; the corresponding speeds are vAi = 5.7 m/s, vBi = 2.1 m/s, and vBf = 4.7 m/s. What is velocity vAfincluding sign, where positive denotes motion to the right)? In the figure, block A (mass 1.6 kg) slides into block B (mass 2.5 kg), along a frictionless surface. The directions of velocities before and after the collision are indicated; the corresponding speeds are vAi = 5.7 m/s, vBi = 2.1 m/s, and vBf = 4.7 m/s. What is velocity vAfincluding sign, where positive denotes motion to the right)?