Astudent drops a rock from a bridge to the water 11.5 m below. with what speed does the rock strike the water? the acceleration of gravity is 9.8 m/s 2 . answer in units of m/s.

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?

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field

Energy flows from the producer level to the level. is called