positive is force up on feet
691 up - m g down = 0 if motionless
if g = 9.81, m = 70.44 kg
F - m g = m a
where a is up
499 - 691 = 70.44 a
a = -2.73
so accelerating down (negative a)
A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this situation. (c) Calculate the magnitude and direction of the elevator’s acceleration.
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