When both the speed and direction of an object's motion is known, what else is known?

the distance the object has traveled

the velocity of the object

the acceleration of the object

the average speed of the object

Answer is: the velocity of the object.

Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east. Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.