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speed distance an object travels in a unit of time average speed total distance traveled divided by total time taken instantanious speed speed of an object at an instant time velocity speed and direction of motion acceleration change in velocity divided by the time it takes for the change to occur mass amount of matter in an object inertia tendency of an object to resist a change in its motion momentum measure of how hard it is to stop an object law of conservation of momentum total momentum of a group of objects remains constant unless outside forces act on the group