2024, Question 5 · Short Answer · 7 points · about 13 minutes
Two blocks in an elastic collision
Find a block's speed after an elastic collision from its kinetic energy change, extend position graphs for both blocks and the center of mass, and explain how the center of mass line changes if the blocks stick.
This exam had five free-response questions in 90 minutes, worth 7 or 12 points each. The current exam has 4 free-response questions in 95 minutes. The skills these questions practice still count.
Lessons this question draws on
1 Read the question
The question is College Board's, from the 2024 exam. It starts on page 16 of the PDF.
Open Question 5 (PDF, page 16)
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.