First Law Of Newton

Everybody will persist in its state of rest or of uniform motion (constant velocity) in a straight line unless and untill it is compelled to change that state by forces impressed on it. This means that in the absence of a non-zero net force, the center of mass of a body either is at rest or moves at a constant velocity.

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EXAMPLE

If we drop a marble from a height h, then the marble will roll and try to get to h and if he is not able to, then it keeps on moving.

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