Explanation
Work done on the wire to strain it will be stored as energy which is converted to heat. Therefore, the temperature increases.
Due to theory of relativity
Both part will have numerically equal momentum and lighter part will have more velocity.
In compression or extension of a spring work is done against restoring force.
In moving a body against gravity work is done against gravitational force of attraction.
It means in all three cases potential energy of the system increases.
But when the bubble rises in the direction of upthrust force then system works, so the potential energy of the system decreases.
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