where the acceleration of gravity is approxi-

mately 10 m/s2 and the positive directions for

displacement, velocity, and acceleration are

upward.

At time t = 0 s, an elevator is at a displace-

ment of x = 0 m with a velocity of v = 0 m/s.

A student whose normal weight is 400 N

filipkowska (kf6839) – Chapter 4 Quiz – wollins – (1954) 3

stands on a scale in an elevator and records

the scale reading as a function of time. The

data are shown in the graph.

0

200

400

600

800

0 5 10 15 20

time (s)

Scale Reading (N)

In which direction does the force due to the

scale act on the student?

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