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Consider the following statements in the case of perfectly plastic impact of two particles:

            1. There is no period of restitution.

            2. Both the particles are together after impact.

            3. Total momentum of the particles is conserved.

            4. Kinetic energy of the particles is conserved

            Which of these statements are correct?

            (a) 1 and 2 only           (b) 1, 2 and 3

            (c) 2 and 3 only           (d) 2, 3 and 4

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