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Answer :
Density of sealed packet = \( \frac{500}{350} \ = \ 1.42 g/cm^3 \)
Density of sealed packet is greater than density of water
\(\therefore \) the packet will sink.
From Archimedes Principle, we know that
Displaced water volume = Force exerted on the sealed packet.
Volume of water displaced \( = 350 cm^3 \)
\(\Rightarrow \) displaced water mass = ? x V
\(\Rightarrow \) displaced water mass = 1 × 350
\(\therefore \) Mass of displaced water = 350g.