A train is travelling at 50 ms-1 when the driver applies the brakes and gives the train a constant deceleratic of magnitude 0.50 ms-2 for 100 s. Describe what happens to the train. Calculate the distance travelled by the train in 100 s

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.

Yes

That depends on what kind of environ meant it is in  in space it has the same force that was applied when the velocity was gained