A stretched rubber has ______.

The correct answer is Increased Potential energy.

Key Points 

• When you stretch a rubber band, the energy transferred is stored in the form of potential energy.
  • When elastic is stretched, it's loaded with potential energy, when released there is a shift to kinetic energy.
  • This is especially true if the elastic is transporting another object, such as with a rock being flung from a slingshot.
  • Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

Additional Information 

• Muscular energy is the conscious movement of energy along the lines of the body, drawing muscle to bone and connecting limbs to joints as the energy moves ever inward to the body's core.
• Mechanical energy is the sum of the kinetic energy, or energy of motion, and the potential energy, or energy stored in a system by reason of the position of its parts.
  • Neglecting friction at the pivot and air resistance, the sum of the kinetic and potential energies of the pendulum, or its mechanical energy, is constant.
• Kinetic energy is a form of energy that an object or a particle has by reason of its motion.
  • Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.