What is measure of inertia of body?

Mass of body is measure of its inertia.
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What happens to a stone tied to the end of string and whirled in a circle if the string suddenly breaks?


If the string suddenly breaks, the stone will fly off tangentially along the straight line due to inertia of direction. This is because, the velocity at any point is directed along the tangential at that point. 
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Which law of motion defines the force?

Force is defined by Newton’s first law of motion. 
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Which law of motion gives the quantitative knowledge of force?

Newton’s second law of motion quantitatively defines force.  
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Which law of motion is also called law of inertia?

Newton’s first law of motion is the law of inertia.
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