# Swinging balls

As shown above, several polished steel balls(with the same mass) are hanged in a straight line in contact with each other. Suppose that the ball $$A$$ is pulled back to the height of $$h$$ to the left and allowed to strike the line. Which of the following statements is correct?

a) Right after the collision between the ball $$A$$ and ball $$B$$, the ball $$G$$ flies to the height of $$h$$ to the right.

b) If we pull back the balls $$A$$ and $$B$$ to the height of $$h$$ to the left and allow them to strike the line, then the ball $$G$$ flies to the height of $$2h$$ to the right.

c) If we pull back the balls $$A$$, $$B$$ and $$C$$ to the height of $$h$$ to the left and the balls $$F$$ and $$G$$ to the height of $$h$$ to the right, and allow them to strike the line simultaneously, then the ball $$D$$ will not move.

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