{"correct_answer":null,"difficulty":2,"mark_scheme":"B) Distance\u2013time graph with straight sloping line","max_marks":1,"ordering_type":"weakness","question_id":"db_76","question_text":"Which graph shows constant speed? A) Distance\u2013time graph with straight horizontal line B) Distance\u2013time graph with straight sloping line C) Velocity\u2013time graph sloping down D) Velocity\u2013time graph curve","question_type":"mcq","source":"database","subject":"Physics","topic":"Forces"}