sau 20s đoàn tàu giảm tốc độ từ 72km/h xuống còn 36m/h sau đó chuyển động đều trong thời gian 30s . Cuối cùng chuyển động chậm dần đều và đi thêm được 40m nữa thì dừng lại

the total distance traveled by the car is

30km + 49km = 79 km .

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

there are no components of a physical goal mentioned on the list of choices that you've provided.