Consider the following two statements (A) Linear momentum of a system of particles is zero (b) Kinetic energy of a system of particles is zero' Then

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A implies B and B implies A

A does not imply B and B does not imply A

A implies B and B does not imply A

A does not imply B but B implies A.

answer is D.

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Detailed Solution

If the vector sum of the velocities of the particles of a system is zero , then linear momentum of the centre of mass of the system is also zero, but kinetic energies of the particles are not zero .If kinetic energy of a system of particles is zero then the particles must be at rest and in that case linear momentum of the system must be zero.Hence option (4) is right .

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