Jan made a diagram to compare speed and velocity. which label belongs in the area marked x? is always constant includes magnitude has direction depends on a reference frame

The correct answer to the question is it has direction .

EXPLANATION:

Before coming into any conclusion, first we have to understand a vector.

A vector is a  physical quantity which not only requires magnitude but also direction for its complete specification. It is also in accordance with parallelogram law of vector addition.

The speed of a body is a scalar quantity. It has only magnitude . On the other hand, velocity is the speed in a given direction. Hence, it has magnitude as well as direction.

The speed of a body is simply distance travelled per unit time while velocity is the net displacement of a body per unit time. Since, time is relative and dependent on frame of reference, so both speed and velocity depend on frame of reference.

The area marked X lies in velocity region will contain the properties which are not in speed region.

Hence, the area marked X will denote simply that velocity has direction.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide