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Work and Mechanical Energy

AP Physics 1· difficulty 2/5

A 2 kg2~\text{kg} object speeds up from 3 m/s3~\text{m/s} to 5 m/s5~\text{m/s}. The total work done on it is

  • A

    16 J16~\text{J}

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  • B

    2 J2~\text{J}

  • C

    8 J8~\text{J}

  • D

    4 J4~\text{J}

Explanation

W=ΔK=12(2)(52−32)=(25−9)=16 JW = \Delta K = \tfrac{1}{2}(2)(5^2 - 3^2) = (25 - 9) = 16~\text{J}.

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