Long answer·Hard exam skill (4/5)·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 block moving at enters a rough horizontal patch. A constant frictional force of acts over .
Total: 5 marks
(a) Find the initial kinetic energy. (1 mark)
(b) Find the work done by friction. (1 mark)
(c) Find the final kinetic energy. (1 mark)
(d) Find the final speed. (2 marks)
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