Final answer:
To calculate an object's velocity, you must know the object's speed and direction.
Step-by-step explanation:
In order to calculate an object's velocity, you must know the object's speed and direction. Velocity is a vector quantity that takes into account both the speed and direction of an object. Speed, on the other hand, is a scalar quantity that only measures how fast an object is moving, regardless of its direction.
For example, if you know that a car is traveling at a speed of 60 mph towards the east, then the car's velocity is 60 mph east. However, if you only know that a car is traveling at a speed of 60 mph, then you do not have enough information to determine its velocity.