A piece of wood is taken deep under water and released. It will move up with a acceleration.

constant upward

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decreasing upward

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uniform

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Solution

The correct option is B decreasing upward
The block will accelerate upwards due to bouyant force. And as the upward velocity increases, the viscous force on it keeps on increasing in the downward direction resulting in decreasing net upward acceleration.

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A piece of wood is taken deep inside a long column of water and released it will move up

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