Question: A ( 4 2 mathrm { ~kg } , 5 . 4 - mathrm { m } ) - long beam

A \(42\mathrm{~kg},5.4-\mathrm{m}\)-long beam is supported, but not attached to, the two posts in (Figure 1). A 25 kg boy starts walking along the beam.
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A \ ( 4 2 \ mathrm { ~kg } , 5 . 4 - \ mathrm { m

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