Physics

Physics

Problem

A

60\,\text{kg}

passenger steps onto a scale in an elevator at rest at time

t = 0

. From

t = 0

to

t = 3.0\,\text{s}

the scale reads

840\,\text{N}

. From

t = 3.0\,\text{s}

to

t = 5.0\,\text{s}

it reads

540\,\text{N}

. What is the elevator’s speed at

t = 5.0\,\text{s}

? (Take

g = 9.8\,\text{m/s}^2

.) a)

14.2\,\text{m/s}

upward b)

13\,\text{m/s}

upward c)

11\,\text{m/s}

upward d)

1.6\,\text{m/s}

downward

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