The model shows the magnetic field lines of object A. The first diagram represents the magnetic field of object A before object B is moved into place. The second diagram represents the magnetic field of object A when object B is held in place next to object A. Use the magnetic field lines to determine whether object B is a magnet, a piece of iron, or a bar of nonmagnetic material. Explain your answer.
Describe the movement of object B when it is released. Explain your answer.

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)