A girl is standing still in the middle of a baseball field. The girl catches the baseball and begins to move in the same direction as the thrown ball.

When the girl catches the baseball, the ball and girl move together afterward, so the collision is inelastic. The baseball transfers momentum to the girl, causing her to move in the same direction the ball was thrown. Therefore, the correct choice is “inelastic, since the girl moves in the same direction as the thrown ball.”

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