A 0.4kg ball is thrown straight up into the air and reaches a maximum altitude of 20m. Taking its initia position as the point of zero potentia energy and using energy methods, find (a) its initia] speed, (b) its total mechanical energy, and (c) the ratio of its kinetic energy to the potential energy when the ball is at an altitude of 10m.​

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.