Answer:
potential energy to kinetic energy
Step-by-step explanation:
In this system, the energy transformation is from potential energy to kinetic energy.
Potential energy is the energy due to the position of a body.
Kinetic energy is the energy due to the motion of a body.
When the rubber band is stretched, it stores elastic potential energy. This energy is transformed to kinetic energy as it is release and it begins its motion.
Therefore, potential energy is transformed to kinetic energy.