where the acceleration of gravity is approxi-
mately 10 m/s2 and the positive directions for
displacement, velocity, and acceleration are
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 5 10 15 20
Scale Reading (N)
In which direction does the force due to the
scale act on the student?