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Newton's Second Law (Translational Dynamics)

AP Physics 1· difficulty 2/5

A 50 kg50~\text{kg} student rides an elevator accelerating <strong>downward</strong> at 3.0 m/s23.0~\text{m/s}^2. Using g≈10 m/s2g \approx 10~\text{m/s}^2, what does the scale read?

  • A

    650 N650~\text{N}

  • B

    150 N150~\text{N}

  • C

    500 N500~\text{N}

  • D

    350 N350~\text{N}

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Explanation

N=m(g−a)=50(10−3)=350 NN = m(g - a) = 50(10 - 3) = 350~\text{N}.

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