Question: (c) A small block slides down a frictionless loop-the-loop track, as shown in the diagram below. Which of the free-body diagrams best represents the forces

(c) A small block slides down a frictionless loop-the-loop track, as shown in the diagram below. Which of the free-body diagrams best represents the forces acting on the block at the top of the loop? (W is the weight of the block. N is the normal force.) The normal force must be directed out from the track. If the track is above the block, the normal force must be directed downward
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