Answer :
So we want to know to what is the pulse transformed that traveled the length of a stretched spring. So a pulse is a part of a mechanical wave, and mechanical waves are energy transfer trough some medium, in this case a stretched spring. So the correct answer is (1) energy. The pulse cant be transferred into mass.
Answer: The correct answer is energy only.
Explanation:
Wave is a disturbance which carries energy from one particle to another particle. It is a continuous disturbance.
Pulse is a single disturbance. It is non repeating single bump. It carries energy only. For example, a person is holding one end of the rope. He is moving that end. The pulse will create through the rope.
A pulse travels the length of a stretched spring. The pulse transfers the energy only.
Therefore, the correct option is (1).