Step-by-step explanation:
The path followed by an object when it is thrown at an angle from certain height under the action of gravity is called projectile motion.
A football thrown in the air, it is an example of projectile motion because the football will move in a curved path under gravitational force.
A kite flying on a string, it is not an example of projectile motion because the kite is not moving in any curved path. It will move to a certain height unless someone opposes it.
A golf ball rolling off a table, it is an example of projectile motion because the ball will move under the action of gravity in a curved path.
Water spraying from a fountain, it is again an example of projectile motion because water is moving in a curved path and reaches at the surface of Earth.
Hence, "a kite flying on a string" is not an example of projectile motion.