A ball is throw into the sky at 18m/s. How high can it reach?

The maximum height of the ball will be "16.53 m".

Explanation:

Given that,

As we know,

The initial as well the final height on the ball will be same after it reaches it's maximum height.

then,

⇒

where,

hence,

The max height of the ball will be:

⇒

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

it is called kinetic energy