A marble is dropped from 2.5 m and hits the ground in 0.71 s. What is the final velocity before it hits the ground?

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

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.