Water flows out of a horizontal drainpipe at the rate of 120 kg per minute. Its initial vertical velocity is zero and it falls 3.20 m to the ground. What is the average force it exerts when it hits the ground?
(A) 6.0 N (B) 10.0 N (C) 12.0 N (D) 16.0 N (E) 20.0 N