Which quantity includes direction and is defined as speed with direction?

Which quantity includes direction and is defined as speed with direction?

• A. Speed
• B. Inertia
• C. Velocity
• D. Mass

Answer: (C)

Velocity is the quantity that includes direction. It is the rate at which position changes, described with both how fast and which way you’re moving. That’s why it’s defined as speed with direction. Speed, in contrast, is just how fast something is moving and has no direction attached. Inertia is the resistance to changes in motion, not a motion measurement with direction, and mass is a scalar quantity that measures the amount of matter without any direction. So the one that captures both speed and the direction of motion is velocity, often illustrated as something like 60 kilometers per hour north.

Velocity is the quantity that includes direction. It is the rate at which position changes, described with both how fast and which way you’re moving. That’s why it’s defined as speed with direction. Speed, in contrast, is just how fast something is moving and has no direction attached. Inertia is the resistance to changes in motion, not a motion measurement with direction, and mass is a scalar quantity that measures the amount of matter without any direction. So the one that captures both speed and the direction of motion is velocity, often illustrated as something like 60 kilometers per hour north.