Fixed error in quiz question in ch 4 (momentum).

content/momentum.md

@@ -358,10 +358,9 @@ from jupyterquiz import display_quiz
 with open("./quizes/chapter5/c5q3.json", "r", encoding="utf-8") as f:
     questions = json.load(f)
 
-display_quiz(questions, shuffle_answers=False)
+display_quiz(questions, shuffle_answers=False, max_width=800)
 ```
 
-
 (sec:totallyelasticcollisions1D)=
 ### Totally elastic collision in one dimension
 

content/quizes/chapter3/c3q1.json

@@ -4,22 +4,22 @@
          "type": "multiple_choice",
          "answers": [
              {
-                 "answer": "$r_{cm} = (\\frac{1}{2}L_2, \\frac{1}{2}L_1)$",
+                 "answer": "$r_\\mathrm{cm} = (\\frac{1}{2}L_2, \\frac{1}{2}L_1)$",
                  "correct": false,
                  "feedback": ""
              },
              {
-                 "answer": "$r_{cm} = (\\frac{1}{2}L_1, \\frac{1}{2}L_2)$",
+                 "answer": "$r_\\mathrm{cm} = (\\frac{1}{2}L_1, \\frac{1}{2}L_2)$",
                  "correct": false,
                  "feedback": ""
              },
              {
-                 "answer": "$r_{cm} = (\\frac{1}{3}L_2, \\frac{1}{3}L_1)$",
+                 "answer": "$r_\\mathrm{cm} = (\\frac{1}{3}L_2, \\frac{1}{3}L_1)$",
                  "correct": true,
                  "feedback": "Correct."
              },
              {
-                 "answer": "$r_{cm} = (\\frac{1}{3}L_1, \\frac{1}{3}L_2)$",
+                 "answer": "$r_\\mathrm{cm} = (\\frac{1}{3}L_1, \\frac{1}{3}L_2)$",
                  "correct": false,
                  "feedback": ""
              }

content/quizes/chapter5/c5q2.json

@@ -14,12 +14,12 @@
                  "feedback": ""
              },
              {
-                 "answer": "$\\frac{m}{m+M} * \\sqrt{2gh}$",
+                 "answer": "$\\frac{m}{m+M} \\cdot \\sqrt{2gh}$",
                  "correct": false,
                  "feedback": ""
              },
              {
-                 "answer": "$(1+\\frac{M/m}) * \\sqrt{2gh}$",
+                 "answer": "$\\left( 1 + \\frac{M}{m} \\right) \\cdot \\sqrt{2gh}$",
                  "correct": true,
                  "feedback": "Correct"
              }