In an experiment with a beam balance an P unknown mass \( \mathrm{m...

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In an experiment with a beam balance an
P unknown mass \( \mathrm{m} \) is balanced by two known masses of
\( \mathrm{W} \) \( 16 \mathrm{~kg} \) and \( 4 \mathrm{~kg} \) as shown in figure.
- Find the value of the unknown mass \( \mathrm{m} \) in \( \mathrm{kg} \).
(1) \( 2 \mathrm{~kg} \)
(2) \( 4 \mathrm{~kg} \)
(3) \( 8 \mathrm{~kg} \)
(4) \( 12 \mathrm{~kg} \)
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