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force and acceleration

An inventive child named Nick wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionlesspulley (see figure below), Nick pulls on the loose end of the rope with such a force that the spring scale reads 280 N. Nick's true weight is 290 N, and the chairweighs 160 N. Nick's feet are not touching the ground. Find Nick's acceleration, using upward as positive.
Find the magnitude of the force Nick exerts on the chair. Instead Nick hands the rope with the scale to his friend Barney, who stands on the ground. Barney pulls onthe rope so that the spring scale again reads 280 N. What is Nick's acceleration now, again using upward as positive.
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