A 2.00 kg ball is thrown upward at some unknown angle from the top of a 20.0 m high building. If the initial magnitude of the
velocity of the ball is 20.0 m/s. What is the magnitude of the
final velocity when it strikes the ground? (Note: Ignore air
resistance.)

it is b. absorbs thermal energy

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.

i think its d if wrong im sorry