Velocity+vc.+Acceloration

This difference is pretty easy to find out. Velocity reveals the direction of the object that is traveling at a given speed. Acceloration simply is the change in the velocity over a time period. Yeah so I bet your think wow that's really helpful, but hear me out. So lets say this bike is going down a nice country road. There a breeze, and he is just enjoying his ride keeping a constant pressure on the gas petal. As you can imagen he isn't going any faster, so he is traveling at a constant velocity.Since he is traveling at a constant velocity there is no acceloration. Sounds nice right, exciting. Out of the middle of nowhere a flying pig swoops into the street and lands in the middle of the road. Lets say the driver is feeling a little feisty and wants everyone to know that he saw the first flying pig, so he figures "hey if I run it over then I will have evidence. So he stomps on the pedal. He does this at point A. Obviously with the added pressure on the pedal the bike rider travels faster. His velocity is increaing. He still in increasing his velocity past point B. Here's the big question did the pig get away in time...
 * Velocity || Acceloration ||
 * displacement/time elapsed || change in velocity/elapsed time ||

A---B

His velocity at point B minus his velocity at point A is the change in velocity. Divide that change in velocity by the time it takes to travel from point a to point be and you get the average acceloration. B---C

lets say he hit the pig for the purpose of this exercise. He wants to collect his winnings so he presses on his brake at point B. By doing that he slows down his velocity. At point C he comes to a complete stop. This is deceleration which is the oposite of acceloration. The brakes apply a force in the oposite direction of the cars motion. He as a negative acceloration.

Tasha