2025, Question 4 · Qualitative Quantitative Translation · 8 points · about 20 minutes
Block rising in fresh and salt water
Compare the upward acceleration of a released block in fresh water and salt water using the forces on it, derive the acceleration from Newton's second law, and check the result against the comparison.
Lessons this question draws on
1 Read the question
The question is College Board's, from the 2025 exam. It starts on page 11 of the PDF.
Open Question 4 (PDF, page 11)
2 Write your answer
Answer each part the way you would on the exam, in full sentences, with your work shown. Your writing saves as you type.
3 Score it
Score your answer against College Board's scoring guidelines, one point at a time. Give yourself a point only when your answer says what the guideline asks for.
Scoring guidelines (PDF, page 13) What the exam readers saw (Chief Reader report)
Question, scoring guidelines and Chief Reader report: College Board. The title and summary are ours.