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Short 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

A 2 kg2\,\text{kg} stone is raised to a height of 5 m5\,\text{m}. Take g=10 m/s2g=10\,\text{m/s}^2. Find its potential energy. If it falls freely, what is its kinetic energy just before reaching the ground, ignoring air resistance?
Total: 2 marks

(a) Find the potential energy at the height. (1 mark)

(b) Find the kinetic energy just before the ground. (1 mark)

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cbse-science-9.u3.t3-4.saq.003

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