An experiment measures the breaking point of identical strips of wood made from different trees. the procedure must contain which of the following instructions? a. performing the experiment outside b. disposing of the broken wood strips c. cleaning up the scattered pieces of wood d. performing the experiment in a safe manner

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.