Practice variation 3 of 3
Vector motion — Why differentiate D squared
Your question
Explain why showing for proves that the distance is increasing, then state the critical angle condition in terms of .
This practice question was inspired by Question 14(d) in the 2024 NSW HSC Mathematics Extension 1 examination, © NESA. It is an original TestMum variation that practises the same mathematical idea, not an official NESA question.
Before you check
- Have you stated every choice or assumption?
- Can another student follow each line?
- Did you verify the final result independently?