The answer depends on the sort of trajectory. If it isthe trajectory of a projectile, affected only by gravity then 3 points are enough. As soon as you add other forces: such a drag or continued propulsion, the number of points required increases.
To determine a trajectory line, only two points are needed. These two points can be used to calculate the slope, which represents the direction and angle of the trajectory. Additional points can be used to further refine the trajectory line and estimate its accuracy.
3
3 points which do not all lie on the same line.
Two distinct (different) points are needed to determine a line.
3
2 points
A Reference Point A reference point is needed to determine if an object is in motion.
A Reference Point A reference point is needed to determine if an object is in motion.
A Reference Point A reference point is needed to determine if an object is in motion.
A Reference Point A reference point is needed to determine if an object is in motion.
To determine a trajectory line, only two points are needed. These two points can be used to calculate the slope, which represents the direction and angle of the trajectory. Additional points can be used to further refine the trajectory line and estimate its accuracy.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
3
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
Two. Two points determine a line. Three points determine a plane.