Which statement is the BEST analysis of the data for the runner? A The runner starts slower and speeds up, reaching a maximum speed between 50 and 70 m, and then slows down during the final 30 m.
B. The runner covers the first 80 m running at a constant speed and then slows down, reaching a minimum speed during the final 20 m
CO The runner starts siower and speeds up, reaching a constant speed between 20 and 80 m, and then speeds up again during the final 20 m
D. The runner covers the first 70 m running at a constant speed and then speeds up, reaching a maximum speed during the final 30 m.
no

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

elctricity and magnet is conversion to it