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A student who weighs 520 N is wearing a backpack that weighs 84 N. The student is standing still on level ground. Give your answers to the following questions in Newtons.

(a) What is the magnitude of the net force on the student?
(b) What is the magnitude of the contact force on the student by the backpack?
(c) What is the magnitude of the contact force on the student by the ground?

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