Kamala puts on inline skates and stands facing a wall. When she pushes against the wall, she rolls backward. Why does pushing harder make her roll faster?

By Newton’s third law, when Kamala pushes on the wall, the wall pushes back on her with an equal and opposite force. Pushing harder means the wall exerts a larger backward force, so she accelerates backward more and rolls faster. Her weight and the ground’s normal force do not explain the change.

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