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science

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If a 150 pound man walks onto an elevator. Suddenly it rises rapidly from the 1st to 14th floor. if the man steps onto a scale in the elevator during the rapid rise, he would weigh...

A) 150 pounds
B) More than 150 pounds
C) Less than 150 pounds

Please explain, thank you.

  • science -

    Ftotal on man = m a
    Force F up on man from scale, mg down on man
    F - mg = ma
    so
    F = m g + m a
    if a is + up then F bigger from scale

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