Answer:

Explanation:
The gravitational force between two corpses is given by the following equation:

Where F is the force, G is the gravitational constant
(
), M and m are the masses of the corpses and d is the distance between them.
So we have that:


<span> B. A person moving a ball through a stream of water</span>
Answer:
I think u have to do 580N times 40KG
For example science has discovered many amazing things like atoms,molecules which led to the development of nuclear reactors etc. Challenges would be like trying to prove theories like evolution for 100 of years trying to discover all the stuff we still don’t know exists all the mysteries of life. A lot of science is still theory we can’t prove some things until we have more advanced technology etc.