A ball is dropped from rest from the top of a cliff 24 m high. From ground level a second ball is thrown straight upward at the same instant that the first ball is dropped. The initial speed of the second ball is exactly the same as that with which the first ball eventually hits the ground. Determine the point where the balls cross paths.( In the absence of air resistance the path of the two balls are exactly opposites.)

A ball is dropped from rest from the top of a cliff 24 m high. From ground level a second ball is thrown straight upward at the same instant that the first ball is dropped. The initial speed of the second ball is exactly the same as that with which the first ball eventually hits the ground. Determine the point where the balls cross paths.( In the absence of air resistance the path of the two balls are exactly opposites.)