A stone is shot vertically upward with velocity 12m/s at the edge of a cliff having a height of 42 meters.
i) What is the position(y) of the stone at t=1.5s? Is the stone on its way or down at that position?
Justify your answer!
ii) Find the time when the stone is y=5m above the cliff when the stone is on its way down only.
iii) What is the position(y) of the stone when the velocity is v=-28m/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.

Ibelieve the correct answer would be c.