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A student plays on a see-saw with her experimental android robot, Robby. The student has a weight of 250 N and is seated 2.8 m

A student plays on a see-saw with her experimental android robot, Robby. The student has a weight of 250 N and is seated 2.8 m from the axis of rotation. Robby balances her when he is seated 0.7 m from the axis. Robby's weight is

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