Newton's Second Law (Translational Dynamics)

AP Physics 1· difficulty 2/5

A 60 kg60~\text{kg} person stands on a scale inside an elevator that accelerates upward at 2.0 m/s22.0~\text{m/s}^2. Using g10 m/s2g \approx 10~\text{m/s}^2, what does the scale read?

  • A

    1200 N1200~\text{N}

  • B

    720 N720~\text{N}

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  • C

    600 N600~\text{N}

  • D

    480 N480~\text{N}

Explanation

Newton's 2nd law (upward positive): Nmg=maN - mg = m a, so N=m(g+a)=60(10+2)=720 NN = m(g + a) = 60(10 + 2) = 720~\text{N}.

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