2. a race car starts at 400 m/s and then stops in 20 seconds. calculate acceleration. acceleration=final velocity - initial velocity/ change in time
a. -20 m/s2
b. 40 m/s2
c. 20 m/s2
d. 55 m/s2

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.