Newton's Cradle is the physics toy with several balls hanging from string in contact with one another. Raise a ball up on one end and after it taps the others a ball flies off the far end while the first ball comes to rest. What happens if you raise one ball on the left side, and two on the right side, to the same height. Let them go so they hit the stack of remaining balls from opposite sides simultaneously?     Two fly off on the left and one files off on the right.     Two fly back on the right and one flies back on the left.     One comes off each side     Two come off each side     Three come off the left and two come off the right.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”