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

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

60\,\text{kg}

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

t = 0

. From

t = 0

t = 3.0\,\text{s}

the scale reads

840\,\text{N}

. From

t = 3.0\,\text{s}

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