Answer:

Explanation:
The mass of one electron is

So the number of electrons contained in M=1.7 kg of mass is

The charge of one electron is

So, the total charge of these electrons is equal to the charge of one electron times the number of electrons:

15) a
16) b
17) a
Hope this helps
Gravitational energy is a form of potential energy because it is dependent on the mass of an object and needs to be calculated for the specific object.