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false, "customName": "", "marks": 0, "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "minMarks": 0, "maxMarks": 0, "shuffleChoices": true, "displayType": "radiogroup", "displayColumns": 0, "showCellAnswerState": true, "choices": ["$L=\\frac{1}{2}m\\dot x^2-\\frac{1}{2}kx^2$", "$L=\\frac{1}{2}m&nbsp;\\dot x^2+\\frac{1}{2}k x^2$", "$L=-\\frac{1}{2}m\\dot x^2+\\frac{1}{2}k x^2$", "$L=m\\dot x -k x$"], "matrix": ["1", 0, 0, 0], "distractors": ["", "", "", ""]}]}]}], "navigation": {"allowregen": true, "reverse": true, "browse": true, "allowsteps": true, "showfrontpage": true, "showresultspage": "oncompletion", "onleave": {"action": "none", "message": ""}, "preventleave": true, "startpassword": ""}, "timing": {"allowPause": true, "timeout": {"action": "none", "message": ""}, 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