Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

The density of salt solution exceeds the density of eggs
Egg absorbs salt from the solution and expands
Water has high surface tension
Albumin dissolves in salt solution and egg becomes lighter

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Physics
Kinetic energy depends on

Both mass and velocity of the moving body
The mass of the moving body
The pressure of the moving body
The velocity or speed of the moving body.

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