A net force XF acts on an object. What does this mean?

1. The object is instantaneously at rest.

2. The object is not resting on the surface of

the earth.

3. The object is moving in a circle.

4. The object is accelerating in the direction

of XF.

5. The object is moving in one direction and

accelerating in another.

X

6. The object is moving in the direction of

F.

7. The object’s velocity and acceleration are

both constant.

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.