system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What is the difference between speed and velocity?


assistant
Speed and velocity are different terms. Speed is a measurement of distance over time. Velocity is a measurement of distance over time in a direction. Speed is scalar and can only be positive. Velocity is a vector and can either be positive or negative. For example, an object moving at a speed of 50 km/h tells us only how quickly it is moving but not its direction. An object with a velocity of +50 km/h tells us its speed and that it is moving forwards. Conversely, an object with a velocity of -50 km/h tells us its speed and that it is moving backward.