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Define inertia.


The property by virtue of which the body cannot change its state of rest or uniform motion in a straight line, unless an external force is acting on the body is called as Inertia. 
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Due to what type of inertia, the spark leaves the grind stone tangentially while sharpening the knife?

When the branches of an apple tree are shaken, the apples fall down. Why?

State Galileo’s law of motion.

A person jumping out from a moving car or bus falls forward. Why?

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