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Object A is acted on by only object B. The mass of object A is 20.0 kg and its
acceleration is 4.00 m/s2 west. Object B is acted on by two forces, the force of object A on
object B and another unknown force. If mass of object B is 40.0 kg and the acceleration of
object B is 3.00 m/s2 west, what is the unknown force?

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