Two identical blocks, each of mass m and speed v, travel towards each other on a frictionless surfac

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Two identical blocks, each of mass m and speed v, travel towards each other on a frictionless surface. The blocks undergo a head-on collision. What is definitely true immediately after the collision?
A. The momentum of each block is zero.
B. The total momentum is zero.
C. The momentum of each block is 2mv.
D. The total momentum is 2mv.

This question is about the usage of concepts from the chapter MECHANICS - collisions, momentum conservation, elastic collision, inelastic collision to answer this MCQ. This question is taken from IBDP Paper-1, TZ2 PHYSICS HL 2021 MAY. EXAM
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