Use the interactive version of a Rube Goldberg machine in the lesson. Fix the device so the flow of energy is not interrupted, and the window shade can be closed. 1. (2pts each) Give three examples, from the lab, where potential energy was converted to kinetic energy:
Example 1

Example 2

Example 3

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.