Case study·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
A firecracker initially at rest bursts into two fragments. Fragment A has mass and moves east at . Fragment B has mass . External forces during the short burst are negligible.
Total: 5 marks
(a) State the total initial momentum. (1 mark)
(b) Find the momentum of fragment A. (1 mark)
(c) Find the velocity of fragment B. (2 marks)
(d) State why momentum conservation can be used. (1 mark)
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