A car travels 500 miles in an oval in 2.5 hour. The car's velocity is zero but how and what does that mean? What is velocity and how do you find it?

Velocity is the same thing as speed, but it includes a direction. 10 miles per hour is a speed. 10 miles per hour toward the northeast is a velocity. You calculate velocity by determining a distance between two points, and dividing it by how long it takes you to get from one to the other. If you do this with two points far away from each other, you'll calculate an average velocity, but if you use two points very close together, you'll approximate your instantaneous velocity. Now, the car has a non-zero *instantaneous* velocity all the time it's moving around the 500 mile oval, but if it winds up back where it started, then the distance it covers is 0 miles. So, when you divide 0 miles by the time, 2.5 hours, you get an *average* velocity of 0 miles per hour. Instead of thinking about an oval, imagine a straight line. If you drive forward 250 miles, realize you forgot your wallet, and put it in reverse to drive back 250 miles, you'll wind up 0 miles from where you started. For average velocity, it doesn't matter whether you go in a straight line, an oval, or any other path. You just measure the straight line distance between the two points, and divide by the time it took to move from one to the other. On the other hand, for average speed (which doesn't include a direction), you would take the total distance traveled. A 500 mile oval in 2.5 hours is an average speed of 200 miles per hour. I hope that helps!