When the kids are throwing balls over the fence, equilibrium is reached when:
A. balls are being thrown in one direction only.
B. balls are being thrown in both directions, but there is no net change in the number of balls on each side of the fence.
C. there are equal numbers of balls on each side of the fence, and the kids stop throwing balls.
D. balls are being thrown in both directions and there are equal numbers of balls on each side of the fence.

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@JFraser D?

wait, sorry

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