Which of the following persons is in an inertial frame of reference?

  • A
    $A$ pilot in an aeroplane which is taking off.
  • B
    $A$ driver driving a bus which is moving with constant velocity.
  • C
    $A$ child revolving in a merry-go-round.
  • D
    $A$ man in a train which is slowing down to stop.

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