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A 72 kg teenager is playing with his 32 kg younger brother on a teeter-totter. The...

A 72 kg teenager is playing with his 32 kg younger brother on a teeter-totter. The teeter-totter is 3.0 m long and support at its center. If the younger brother sits at one end, how far in from the other end of the board does the teenager have to sit to balance the system?

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