Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the magnitude of the minimum force, applied 0.30 m on the other side of the pivot, that is needed to make the child lift off the ground?
A. 75 N
B. 740 N
C. 23 N
D. 44 N
E. 66 N
Answer: B
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