No, the trajectory of a moving point does not depend on the chosen reference frame. The trajectory is a physical path that the point follows through space, and it remains the same regardless of the reference frame used to analyze it.
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Yes it is.
Stationary reference points are chosen to determine motion because they provide a consistent and fixed frame of reference. By using stationary reference points, it is easier to identify when an object is moving relative to its surroundings. This helps in accurately measuring the speed and direction of the object's motion.
The curved path of an object moving through the air is called a parabolic trajectory. This trajectory is a result of the combination of the object's initial velocity and the force of gravity acting on it.
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No, movement can be measured in relation to any reference point, whether fixed in pace or not. Measurements often involve comparing the position of an object or system to a chosen reference point, allowing for the quantitative analysis of its motion. The reference point itself does not necessarily have to be fixed in pace for this comparison to be made.