Physics
The inability of a body to change its state of rest or uniform motion along a straight line is called its

Inertia
Momentum
Acceleration
Velocity

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

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

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