Final answer:
To describe motion, the two quantities used are speed and acceleration. Speed is scalar and acceleration is vector; both are essential in understanding motion. The components consisting of two vectors and a scalar are displacement, velocity, and acceleration.
Step-by-step explanation:
The question which asks about the two quantities that can be used to describe motion has the answer: Speed and acceleration.
Speed is a scalar quantity that describes how fast an object is moving without specifying the direction. It is simply the distance traveled divided by the time during which the motion occurs. On the other hand, acceleration is a vector quantity that describes the rate of change of velocity with time. Therefore, acceleration involves both a magnitude and a direction.
The question which includes two vectors and a scalar has the answer: Displacement, velocity, and acceleration. Displacement and velocity are both vectors because they both have magnitude and direction. Displacement describes the change in position of an object, and velocity describes the speed and direction of the object's movement. Acceleration, as mentioned before, is also a vector as it involves the rate of change of velocity which includes directional information.