Two balls approach each other as shown below. The 6.0 kg ball moves at 4.0 m/s and the 9.0 kg ball moves at 3.0 m/s. If the 6.0 kg ball bounces in the opposite direction at 2.0 m/s what is the velocity of the 9.0 kg ball after the collision? Find magnitude and direction.

i'm on my way to history not a mistory.

not too sure thinking all accelerations are pointed down

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.