Amarshmallow gun uses a spring to launch marshmallows. the spring has a spring constant of 200 n/m. the marshmallow has a mass of 0.05 kg and when the marshmallow gun is fired straight up into the air, the marshmallow reaches a maximum height of 18 meters. what is the mechanical energy in the system?

8.8 J

Explanation:

The mechanical energy of the marshmallow + gun system is conserved. At the beginning, all the energy is stored in the compressed spring; when the marshmallow is fired, this energy is converted into gravitational potential energy: so the mechanical energy of the system is equal to the gravitational potential energy of the marshmallow when it is at its highest point. Therefore, it is

where

m = 0.05 kg is the mass of the marshmallow

g = 9.8 m/s^2 is the acceleration due to gravity

h = 18 m is the maximum height

Substituting, we find

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

unbalanced force

explanation: