The trail of a jet plane is circular (both for an observer standing on the ground and for a pilot of a passenger plane flying by). Does this mean that the trajectory of the jet plane is a circle and in the “passenger plane” frame of reference?
No, Hint. In the “Passenger Airplane” frame of reference, the fog forming the trail of the jet plane is moving.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.