What is the importance of the x- y- cartesian coordinate system in motion of an object in two dimensions?
it is used as a frame of reference.

it directly measures the acceleration of an object.

it determines the time the object is in motion.

it measures the speed of the object.

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.