A block of plastic is released under water. Will it sink or come up to the surface of water ? Give reasons.

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Solution

The density of plastic $d$ (say) is less than the density of water.
Hence when released in water, the weight of the plastic $V d g$ acts downwards, and the buoyant force $V ρ g$ acts upwards.
Since $d < ρ$ , the buoyant force is greater than the weight and hence the plastic blocks comes to the surface.

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A block of plastic is released under water. Will it sink or come up to the surface of water ? Give reasons.

The density of plastic d(say) is less than the density of water.Hence when released in water, the weight of the plastic Vdg acts downwards, and the buoyant force Vρg acts upwards.Since d<ρ, the buoyant force is greater than the weight and hence the plastic blocks comes to the surface.