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A body is projected vertically upwards. Its momentum is gradually decreasing. In this

1. it is a violation of law of conservation of linear momentum
2. momentum of the body alone gets conserved
3. momentum of the body, earth and air molecules together remains constant
4. violates law of conservation of energy.

Correct answer: momentum of the body, earth and air molecules together remains constant

Solution

As the body rises, gravity and air resistance reduce its momentum, but those are internal interactions if you consider the body, Earth, and air together. For the complete isolated system, total linear momentum remains constant.

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