5. Bill has a mass of 70 kg and is running. He collides with Ethel, who is sitting in a chair with wheels. Ethel's mass is 50 kg. Bill falls into Ethel's lap and they both go rolling at 5 m/s. How
fast was Bill running before the collision?

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

not too sure thinking all accelerations are pointed down

k2s for potassium sulphide

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.