Based on the graph, which statement best describes the acceleration of the two objects?
a) acceleration 1 - no acceleration. acceleration 2 - negative acceleration.
b) acceleration 1 - no acceleration. acceleration 2 - speeds up and slows down.
c) acceleration 1 - constant acceleration. acceleration 2 - varied acceleration.
d) acceleration 1 - positive acceleration. acceleration 2 - negative acceleration.

C)Acceleration 1 - constant acceleration. Acceleration 2 - varied acceleration.

Explanation:

In a velocity-time graph, the acceleration corresponds to the slope of the curve.

In fact, acceleration is defined as the ratio between the change in velocity and the time interval:

However, we see that in a velocity-time graph, corresponds to the increment in the y-variable (), while corresponds to the increment in the x-variable (). Therefore, acceleration can also be written as

which is exactly the definition of slope of the curve.

Now we notice that:

- For object 1, the slope is constant: this means that the acceleration is constant

- For object 2, the slope varies: this means that the acceleration varies as well

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