Question

why momentum is considered equal to zero when a body comes to rest ?

Answer 1

Answer:

momentum is nothing but the quantity of motion. At rest, the quantity of motion is zero hence momentum is considered equal to zero when a body comes to rest.

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Answer 2

Answer:

Momentum is the product of velocity and mass of the body. So if a body comes to rest its velocity becomes zero so the momentum of the body will also gets zero when a body comes to rest.