Question

Why speed is a scalar quantity but velocity is a vector quantity ?

Answer 1

Answer:

Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is direction-aware

Answer 2

In everyday use and in kinematics, the speed of an object is the magnitude of the change of its position; it is thus a scalar quantity.