What is the best way to determine levelness?

A. See if the Acceleration versus Time for both directions are both zero.

B. Plot the Acceleration versus Time for one direction and acceleration should be zero.

C. Plot Position versus Time and compare the linear fit from each direction of travel; slopes should be equal.

D. Plot Position versus Time and compare the linear fit from each direction of travel; slopes should be equal but opposite.

E. Plot Velocity versus Time for both directions; slopes should be equal.

F. See if slope of Velocity versus Time for both directions are equal but opposite.

F. See if the slope of Velocity versus Time for both directions are equal but opposite.

Explanation: Velocity is the rate of change of position. The slope of a distance or position-time graph is velocity. Acceleration is the rate of change of velocity. The slope of a velocity-time graph is acceleration.

A velocity-time graph shows changes in the velocity of a moving object over time. The slope of a velocity-time graph represents an acceleration of the moving object.

So, the value of the slope at a particular time represents the acceleration of the object at that instant.

what is the question because that is not a question.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia