Answer:
7 m to the left of the line of fire.
213.55 m from the foot of the wall.
7.25 m above the ground.
Explanation:
Let's assume the height is the y-direction, the line of fire is in x-direction. Since there is no external force acting in z-direction, z-coordinate of the center of mass of he ball should be zero. In order to make z-coordinate zero other ball should fall symmetrically with respect to z-axis. So, z-coordinate of 19 kg ball = -7 m.
Hence, 7 m to the left of the line of fire.
The balls do not have any external force in x-direction. Thus, in x-direction, the center of mass should move with constant velocity. x-coordinate of center of mass at t = 1.5 s is:
Hence, 213.55 m from the foot of the wall.
Height fallen by the center of mass at t = 1.5 s.
Hence, y-coordinate of the center of mass is:
Hence, 7.25 m above the ground.