Which one of the following statements about proprioceptive neuromuscular facilitation (pnf) is most accurate? it involves a very small amount of resistance. it involves bouncing, repetitive movements. it can cause more muscle soreness than other types of stretching. it is the most common and practical type of stretching.

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.