Aball is dropped from rest from the top of a building. what force is responsible for the downward motion of the ball?

Which is not true about oxygen-17 and oxygen-18?

What is friction? how does it affect the motion of an object?

This is a form of winter precipitation. it is frozen precipitation falling as ice pellets. snowflakes melt into raindrops as they pass through a thin layer of warmer air. the raindrops then refreeze into particles of ice when they fall into a layer of sub-freezing air near the surface of the earth. this precipitation is called a) hail. b) rain. c) sleet. d) snow.