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19. Figure 8.19 shows a cube at rest and a small object heading toward it. (a) Describe the directions (angle 0, ) at which the small object can emerge after colliding elastically with the cube. How does 8, depend on b, the so-called impact parameter? Ignore any effects that might be due to rotation after the collision, and assume that the cube is much more massive than the small object. (b) Answer the same questions if the small object instead collides with a massive sphere. After Before D X E O