The car speeds up. acceleration is opposite to the motion, the speed of the object decreases. The car slows down. Slowing down is also called negative acceleration.
distance divided by time
Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity.
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One of the parameter for motion used is Speed. Galileo first gave the formula to get the speed that is distance over time. Speed doesn’t covered length or distance only through the quantity called scalar, the measure of speed is also defined. scalar quantity has only magnitude, it has a single element of a number field that is real number.
It's an inverse variation.