Question: which force acts on an object in free fall
[{'answer': 'gravity', 'provenance': [{'wikipedia_id': '80825', 'title': 'Free fall', 'start_paragraph_id': 1, 'start_character': 62, 'end_paragraph_id': 1, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '80825', 'title': 'Free fall', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 250, 'bleu_score': 0.9022045190074791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11774322233009400920}, 'section': 'Section::::Abstract.'}]}]