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   ocr: What IS velocity? During a pinball game, a ball may roll down the field at a speed of 2 meters per second (m/s). After hitting a lever flipper, it: might still be rolling at 2 m/s, but this time back up the field. At both times the ball is moving at the same speed, but with a ditterent velocity. An object's velocity 1S defined by (wo things: both the object's speed, and the direction that the object 1S moving in. A quantity, like velocity (which has both. a size and a direction), is called a vector. You can show which direction something 1s moving 1n by using positive and negative velocities. ...