When a 0.32-kg block is suspended on a vertical spring, it causes it to stretch 3.50 cm. If the block is now pulled 8.40 cm below its equilibrium position and released, what is the speed of the block when it is 1.00 cm above the equilibrium position?

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.