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    Checked by Engr. Mehmood Kakar · MSc Physics, M.Ed · 8 years teaching physics
    Q33 marks

    A 500 g ball moves at 36 km/h. Calculate its kinetic energy.

    1. EquationEk = ½ m v²
    2. Convertm = 500 ÷ 1000 = 0.5 kg
    3. Convertv = 36 ÷ 3.6 = 10 m/s
    4. SubstituteEk = 0.5 × 0.5 × 10²Tip: square the value of v first
    5. AnswerEk = 25 J
    Worked answer: convert 500 g to 0.5 kg and 36 km/h to 10 m/s, substitute into Ek = ½mv², square the speed first, giving 25 J.
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    Guides

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    How to rearrange physics equations

    The balance method, formula triangles and five worked examples, including square roots.

    GCSE physics units and prefixes

    Every SI unit, prefixes from nano to giga, and the conversions that cost marks.

    How to show your working

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    Kinetic energy exam questions

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    GPE exam questions

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    Density required practical

    How to measure the density of regular and irregular objects and liquids, with a worked results table.

    Engr. Mehmood Kakar

    Written by a physics educator

    Engr. Mehmood Kakar

    SolvedPhysics is run by Engr. Mehmood Kakar (MSc Physics, B.Ed, M.Ed), who has taught physics for 8 years and trains other teachers. Every solver and worked answer is checked against the AQA GCSE Physics specification before it goes live.

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