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Q.

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

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a

it is a violation of law of conservation of linear momentum

b

momentum of the body alone gets conserved

c

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

d

violates law of conservation of energy

answer is C.

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Detailed Solution

The body collides with the air molecules and it also interacts with the earth.So the resultant external force acting on the system consisting of the projectile, air molecules and the earth is zero and momentum of the system remains conserved.
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