Figure Q3.16 shows an unlabeled force diagram for a moving object that is missing one force. The length of the sides of the square grid corresponds to a force magnitude of 1 N. Which additional force has to be exerted on the object so that the object (I) moves at a constant speed, (II) accelerates downward, (III) accelerates upward, and (IV) moves down? For each case, choose all answers from (a) to (f) that are correct.
e.
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