Aball is thrown downward from some height above the ground. at the instant before it reaches the ground, the ball's kinetic energy will be equal to which of the following? a. its  initial kinetic energy b. its initial potential energy c. the sum of  its initial potential energy and its kinetic energy d. the difference between  its initial potential energy and its  kinetic energy

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

3.2x10^7