The potential energy is defined as the energy is contained in the body due to the height over the surface of the earth and it is calculated from the equation

<em>where:</em>
- PE: the potential energy in Joules.
- m: the mass of the body in kg.
- g: the acceleration due to the gravity in m/

- h: the height of the body over the earth in meters.
<em>in our problem:</em>

1)

Answer:
d. 12.25J
------------------------
2)
According to the conservation of energy:

Answer:
b. 12.25
-------------------------------
3)

Answer:
d. 0 kg∙m/s
-----------------------------------------
4)
Using conservation of momentum:

Answer:
b. 0 kg•m/s
The troposphere contains 80% of the the atmosphere, including the majority of gases and water vapor.
Hope it helps!
Answer:
True we need greenhouses for carbon dioxide
The current in the circuit drops and reduces, because of the higher voltage.
Because of the higher potential difference, the current in the circuit reduces as well.