Physics

The correct answer is D. "40 m/s north" represents a velocity.

Velocity is a vector quantity that includes both the magnitude (speed) and the direction of an object's motion. It describes how fast an object is moving and in what direction.

Option A, "40 m," is incorrect. It only represents a distance or magnitude without any indication of direction. To be considered velocity, both the magnitude and direction must be specified.

Option B, "40 m north," is also incorrect. While it specifies a direction, it does not include the magnitude (speed) of the motion. Velocity requires both the magnitude and direction to be specified.

Option C, "40 m/s," is incorrect. It represents speed, w...