The sum of products of masses and velocities of two moving bodies before and after their collision remains the same .The law involved here is:

Law of conservation of mass

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Law of conservation of velocity

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Law of conservation of energy

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Law of conservation of momentum

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Solution

The correct option is D Law of conservation of momentum
Law of conservation of momentum states that initial and final momentum of the system is conserved just before and just after the collision i.e $P = c o n s t a n t$
$∴$ $\sum m_{i} v_{i} = c o n s t a n t$
Thus option D is correct.

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The sum of products of masses and velocities of two moving bodies before and after their collision remains the same .The law involved here is:

The correct option is D Law of conservation of momentumLaw of conservation of momentum states that initial and final momentum of the system is conserved just before and just after the collision i.e P=constant∴ ∑mivi=constantThus option D is correct.

The correct option is D Law of conservation of momentum
Law of conservation of momentum states that initial and final momentum of the system is conserved just before and just after the collision i.e $P = c o n s t a n t$
$∴$ $\sum m_{i} v_{i} = c o n s t a n t$
Thus option D is correct.