This is a Science question NO LINKS Motion is
displacement
a change of position in relation to another object
an object you look at to determine if something is moving
speed

i think it's 35 meters

i think the answer is a, hope this : )

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.