posted by Jake .
A 4.9 g marble is fired vertically upward using a spring gun. The spring must be compressed 8.0 cm if the marble is to just reach a target 29 m above the marble's position on the compressed spring.
(a) What is the change in the gravitational potential energy of the marble-Earth system during the 29 m ascent?
(b) What is the change in the elastic potential energy of the spring during its launch of the marble?
(c) What is the spring constant of the spring?
all of your answers are wrong.