Correction to q2 of energy (c4q2, missing fig).

content/energy.md

@@ -64,6 +64,10 @@ with open("./quizes/chapter4/c4q2.json", "r", encoding="utf-8") as f:
 
 display_quiz(questions, shuffle_answers=False)
 ```
+```{figure} images/quizes/c4q2_uphill.png
+:name: fig:c4q2_uphill
+:width: 400px
+```
 
 
 ```{index} conservative force

content/quizes/chapter4/c4q2.json

 [
      {
-         "question": "You (65 kg) climb the hill shown in the the image below. Find the total amount of work you need to do against gravity. $F_g = mg$",
+         "question": "A student (65 kg) climbs the hill shown in the the image below. Find the total amount of work she needs to do against gravity. $F_g = mg$",
          "type": "multiple_choice",
          "answers": [
              {
@@ -11,12 +11,12 @@
              {
                  "answer": "2303 kJ",
                  "correct": false,
-                 "feedback": ""
+                 "feedback": "Check your goniometry"
              },
              {
                  "answer": "2551 kJ",
                  "correct": false,
-                 "feedback": ""
+                 "feedback": "Gravity points down"
              }
          ]
      }