Long answer·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Use the collision diagram of the two carts that stick together.
Total: 5 marks
(a) Find the common speed after collision. (2 marks)
(b) Find the initial kinetic energy. (1 mark)
(c) Find the final kinetic energy. (1 mark)
(d) Find the kinetic energy lost. (1 mark)
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