speeding up,roller coaster,rate of change,change of veloctiy,change in velocity,pancakes:) lol jk,rollor coaster,velocity,a racecar racing,a air plane flying,trains are example,rollercoaster,it willl get faster.,change in motion,slowing down,when it goes faster,a car,velocity speed & idk,changing directions,ex: rate of change!!,the amount of wind,