In Figure, block A (mass 0.8 kg) slides into block B (mass 1.2 kg), along a frictionless surface.The directions of three velocities before (i) and after (f) the collision are indicated in the figure; the corresponding speeds are VAi =1.9 m/s, VBi =4.9 m/s, and VBf =2.5 m/s.What are the ; (a) magnitude and (b) direction (left or right) of velocity VAf ? (c) Calculate the total kinetic energy of the system before and after the collision. Is the collision elastic?

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