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

it is a violation of law of conservation of linear momentum

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momentum of the body alone gets conserved

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

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violates law of conservation of energy.

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Solution

The correct option is C momentum of the body, earth and air molecules together remains constant
Since all the forces acting on a body are due to atmospheric particles and due to gravitational pull.
So by including earth and particles in our system we can conserve momentum of the system.

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