Which person is in an inertial frame of reference (pilot taking off, merry-go-round, bus at constant velocity, slowing train)

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

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1. A.
   A person (man) in a train which is slowing down to stop.
2. B.
   A person (child) revolving in a merry-ground.
3. C.
   A person (driver) in a bus which is moving with constant velocity.
4. D.
   A person (pilot) in an aero plane which is taking off.

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

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