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 child runs 55 complete rounds of a circular track of radius 14m14\,\text{m} in 120s120\,\text{s}. Take π=22/7\pi=22/7.
Total: 4 marks

(a) Find the distance covered in one round. (1 mark)

(b) Find the total distance covered. (1 mark)

(c) Find the average speed. (1 mark)

(d) Find the displacement after 5 complete rounds. (1 mark)

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cbse-science-9.u3.t3-2.case.005

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