Two trains $A$ and $B$ are running in the same direction on parallel rails such that $A$ is faster than $B$ . Packets of equal weight are transferred between them. What will happen due to this

  • A

    $A$ will be accelerated but $B$ will be retarded

  • B

    $B$ will be accelerated but $A$ will be retarded

  • C

    there will be no change in $A$ but $B$ will be accelerated

  • D

    there will be no change in $B$ , but $A$ will be accelerated

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