A block of wood of mass m rests on the floor of an elevator cab of mass M that is being pulled upward by a cable. The system consisting of the elevator cab and the block of wood is moving upward with constant acceleration. If the tension in the cable has a constant magnitude T, which of the following expressions correctly gives the magnitude N of the normal force acting on the block due to the floor of the elevator in terms of T, M and m? (Hint: first find the acceleration of the system and then substitute into F = ma for the block of wood)
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