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Two trains A and B are running in the same directions on parallel tracks such that A is faster than B, packets of equal weight are exchanged between them. Then

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There will no change in B but A will be retarded

A will be retarded and B will be accelerated

B will be retarded and A will be accelerated

There will no change in A but B will be retarded

answer is A.

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A will be retarded and B will be accelerated

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