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(B) An inertial frame is a frame of reference that is either at rest or moving with a constant velocity (zero acceleration).In option $A$,the child is

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a driver in a sports car moving with a constant high speed of $200 \ km \ h^{-1}$ on a straight road

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(B) An inertial frame is a frame of reference that is either at rest or moving with a constant velocity (zero acceleration).In option $A$,the child is in circular motion,which involves centripetal acceleration.In option $B$,the car is moving with a constant speed on a straight road,meaning its velocity is constant and its acceleration is zero. Therefore,it acts as an inertial frame.In option $C$,the aeroplane is accelerating during takeoff.In option $D$,the cyclist is changing direction,which involves acceleration.Thus,the driver in the sports car is the correct observer in an inertial frame.

For ordinary terrestrial experiments,the observer in an inertial frame in the following cases is

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