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Newton's second law: Solving for force, mass, and acceleration

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A stunt woman of mass m falls into a net during the filming of an action movie. Assume she experiences upward acceleration magnitude a while touching the net.
A black stick figure is in the middle and is falling downwards. Touching it and below it is a grey net.
What is the correct expression for the normal force magnitude Fn exerted on the stunt woman?
Consider upward as the positive direction.
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