Answer:
C: World War I resulted from a chain reaction involving many nations.
Explanation:
Just did the questions and got it right
I think the answer is D.) the theory of plate tectonics.
If you don't understand plate tectonics then you are lost. <span />
Answer:
the force would increase 4 times more
Explanation
more force results more mass or acceleration
Difference in gravitational potential energy =
(mass) x (gravity) x (difference in height)
= (0.0005 kg) x (9.8 m/s²) x (4m - 2.5m)
= ( 0.0049 kg-m/s²) x (1.5 m)
= 0.00735 joule .