Question: ​ stress that is converted to positive energy is called
[{'answer': 'elastic energy', 'provenance': [{'wikipedia_id': '3617189', 'title': 'Elastic energy', 'start_paragraph_id': 1, 'start_character': 440, 'end_paragraph_id': 1, 'end_character': 454, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3617189', 'title': 'Elastic energy', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 1226, 'bleu_score': 0.9346688398020281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17347978594693268850}, 'section': 'Section::::Abstract.'}]}]