Question:
You know your mass is 62 kg, but when you stand on a bathroom scale in an elevator, it says your mass is 77 kg. What is the acceleration of the elevator, and in which direction?
Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.
Quick Answer:
$2.4 \textrm{ m/s}^2$
Giancoli 7th Edition, Chapter 5, Problem 47
(2:90)