Why does a block of plastic released unter water come up to the surface of water?

Buoyant force > Gravitational force

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Buoyant force = Gravitational force

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Buoyant force < Gravitational force

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Gravitational force < Buoyant force

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Solution

The correct option is A Buoyant force > Gravitational force
Apparent weight W' = W - B
$∴$ B>W $⟹$ W' <0 i.e the object comes to the surface of water
Hence plastic under water come up to the surface of water because the buoyant force acting on it exceeds its gravitational force.

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