<span>The weight of the spacecraft keeps changing.
</span>
<span>The mass of the spacecraft remains the same.
These are the correct answers</span>
The electrostatic force between two point charges is given by:

where

is the Coulomb's constant
q1 and q2 are the two charges
r is the distance between them
In our problem, charge 1 is

while charge 2 is

and their distance is
r=5.0 cm=0.05 m
So, the electrostatic force between them is

And the negative sign means the force is attractive, because the two charges have opposite sign.
Answer:
+1 ion
Explanation:
Alkali metals are metals that are found in Group I of the periodic table. Their electronic configuration is such that their valence shell in grounds state is always holding only one electron which they always lose when reacting with non-metals. A loss in an electron makes the atom electrically imbalanced and hence becoming a +1 ion.