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Lithuim t1_iu4q9aj wrote

The child is then relaying that reaction force to the ground.

The wagon accelerates in one direction and the Earth accelerates in the other.

Since the Earth is 24 orders of magnitude more massive, the F=ma acceleration of the earth is 24 orders of magnitude smaller.

Wagon goes 2mph east, earth goes 0.000000000000000000000002mph west.

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