There is a "cannon" that is a 3-ft diameter tube that is 12-ft. long with a stiff spring inside. The spring will be compressed to 1/10 its normal length and held. You will be on the spring. With perfect aim you will fly through the air over a 15-ft wall and land safely in a net. The spring is 10-ft. long. When you hang on the spring w/o touvhing the ground it stretches by 2-ft. Is it possible to make it over the wall?