A6kg rock is thrown vertically upward from the top of a cliff that is 28m high. it was thrown with a speed of 11ms . calculate the greatest height of the rock as measured from the base of the cliff.

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

Which are causes of mechanical weathering? (check all that apply) a. acid rain b. plant growth c. animal actions d. carbon dioxide e. pressure release i chose b & e and got the question wrong.

Which system of units is used by only a small number of countries in the world, including the u.s.