For ordinary terrestrial experiments, which of the observers below are inertial and which non-inertial:
(a) a child revolving in a "giant wheel",
(b) a driver in a sports car moving with a constant high speed of 200 kmh-1 on a straight road.
(c) the pilot of an aeroplane which is taking off,
(d) a cyclist negotiating a sharp turn,
(e) the guard of a train which is slowing down to stop at a station?