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

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$A$ driver in a sports car moving with a constant high speed of $200 \ km/h$ on a straight road.

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(B) An inertial frame of reference is one 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 sports car is moving with a constant speed on a straight road,meaning its velocity is constant and its acceleration is zero. Thus,the driver is in an inertial frame.In option $C$,the aeroplane is taking off,meaning it is accelerating.In option $D$,the cyclist is turning,which involves centripetal acceleration.Therefore,only the observer in option $B$ is in an inertial frame.

For ordinary terrestrial experiments,which of the following observers is inertial?

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