What is your question exactly? I'm confused?
It is A. a refrigerator cause a alternating current is current that doesn't stop and the refrigerator is plug into the wall.
The velocity of the mass after 9 second is 88 m/s
Answer:
Decreased by a factor of 4.5
Explanation:
"We have Newton formula for attraction force between 2 objects with mass and a distance between them:

where
is the gravitational constant on Earth.
are the masses of the object and Earth itself. and R distance between, or the Earth radius.
So when R is tripled and mass is doubled, we have the following ratio of the new gravity over the old ones:




Since
and 

So gravity would have been decreased by a factor of 4.5