If you start at a speed of 4m/s and slow down to 2m/s in 4s what is your
acceleration?

i. like it i'm gonna edit it tomorrow

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

increase masses, decrease separation

mass and volume are the answers you are looking for