what is inertia and momentum?

The tendency of a body to remain in its state of rest or uniform motion in absence of an external force is called inertia. 

Momentum is product of mass and velocity of a body. SI unit of momentum is kgm/s.

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  •  The natural tendancy of objects to resist a change in their state of rest or of uniform motion motion is called inertia.
  •  The mass of an object is a measure of its inertia.Its SI unit is kilogram(Kg).
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If the body is in rest remain in rest or in motion remain in motion untill or unless any external force is not applied.

Momentum is the product of mass into velocity.

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