The photos below show the position of the bottom of the spring with weights in 20 gram increments hanging from it (the top of the spring is at the same location in every case). Calculating the correct...The photos below show the position of the bottom of the spring with weights in 20 gram increments hanging from it (the top of the spring is at the same location in every case). Calculating the correct percent uncertainty for the spring potential energy before the launch is a tricky matter, so we will just use the percent uncertainty of the stretch of the spring prior to the launch.
