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(B) The reading on a spring scale represents the normal force $(N)$ exerted by the floor on the person. According to Newton's second law,$N - mg = ma$

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moves upward with increasing speed

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(B) The reading on a spring scale represents the normal force $(N)$ exerted by the floor on the person. According to Newton's second law,$N - mg = ma$,where $m$ is the mass of the person,$g$ is the acceleration due to gravity,and $a$ is the acceleration of the elevator. Thus,$N = m(g + a)$. The reading is highest when the upward acceleration $(a)$ is positive and maximum. When the elevator moves upward with increasing speed,it has a positive upward acceleration $(a > 0)$,resulting in $N = m(g + a) > mg$. In other cases,the acceleration is either zero or negative (downward),leading to a lower reading.

You stand on a spring scale on the floor of an elevator. Of the following,the scale shows the highest reading when the elevator

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